MFN: 1409 1: SID/SCD 2: 1 3: INPE-1 4: CEA 5: S 6: as 7: [07] 10: Garriot, Owen K. 10: Mendonca, Fernando 12: A comparison of methods used for obtaining electron content from satellite observations - 11p 14: 4917-4927 30: Journal Geophysical Reseach 31: 68 32: 17 40: En 41: En 42: 58: CEA 61: 64: Sept.<1963> 68: PRE 90: b 83: Measurements of the effects of the ionosphere on the polarization and the Doppler shift of radio transmissions from earth satellites permit the electron content of the ionosphere to be calculated. Thirty-five passages of Transit 2A have been analyzed in a variety of ways in order to permit the accuracy of the several methods to be estimated. The most accurate method is a hybrid analysis using both Faraday and Doppler data simultaneously. Methods based on the rate of polarization rotation, on the number of rotations between two times and on best-fitting polynomials to either the Faraday or the Doppler data are compared and their errors estimated 91: FDB-19940119 92: FDB-MLR 101: D MFN: 1410 1: SID/SCD 2: 3 3: INPE-3 4: CEA 5: MP 6: m 7: [07] 16: Comissao Nacional de Atividades Espaciais 18: Report of transequatorial 40: En 41: En 42: 58: CEA 62: INPE 64: <1963> 66: Sao Jose do Campos 68: RPE 91: FDB-19940119 92: FDB-MLR 101: D 114: NAO LOCALIZADO NA ESTANTE MFN: 1412 1: SID/SCD 2: 5 3: INPE-5/LAFE 4: CEA 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais 18: Measurements of the earth's total magnetic field and its variations at a site close to the brazilian anomaly 20: 14 38: Research proposal submitted by the CNAE to AFCRL, OAR through the U.S. Regional Science Office for Latin-America 40: Pt 41: Pt> 42: 58: CEA 62: INPE 64: Dec. <1963> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 91: FDB-19940119 92: FDB-MLR 101: D 83: The objective of the research program of the present proposal is to provide elements of study of phenomena related to geomagnetism. Thus, we intent to complement ionospheric measurements made at this laboratory with geomagnetic field measurements made on the ground and with satellites. We also believe that, even if it were not for the ionospheric measurements, it would still be justifiable to establish a magnetometric station on this site (Sao Jose dos Campos)in view of its geographic position being at the center of the called Geomagnetic Brazilian Anomaly as shown in Fig. 1. It should be called attention also to the fact that the number of stations where magnetic field measurements are made in the northern hemisphere is a region of almost 10:1 in relation to the number of stations in the southern hemisphere. Last year's International Symposium on Equatorial Aeronomy, held in Peru (with sponsorship of AFCRL and others)recommended among other things that aditional magnetic stations should be stablished at selected sites. We intend to start the measurements as soon as possible, in order to get the full span of the IQSY, which extends from January 1964 through December 1965. We also desire to continue the measurements after 1965, while the sun becomes more and more active. Since we have interest in micropulsations studies we would prefer a rubidium vapor magnetometer. However, if not possible, we could use a proton free precession magnetometer regularly in Sao Jose dos Campos and apply for a loan of the rubidium vapor for a period of six months at the time of our rocket soundings at the magnetic equator (Natal)during the IQSY MFN: 1413 91: FDB-19940119 92: FDB-MLR 101: D 1: SID/SCD 2: 6 3: INPE-6/LAFE 4: CEA 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais 18: Studies of long distance and arbund the-world radio wave propagation with the aid of stepped-frequency souding equipment 20: 9 38: Proposal submitted ofthe office Aerospace Research through LAOAR 40: En 41: En 42: 58: CEA 62: INPE 64: Nov. <1963> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b MFN: 1414 91: FDB-19920119 92: FDB-MLR 101: D 1: SID/SCD 2: 7 3: INPE-7 4: CEA 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais 18: Airglow proposal - PHENIX 40: En 41: En 42: 58: CEA 64: Dec. <1963> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b MFN: 1415 91: FDB-19940119 92: FDB-MLR 101: D 1: SID/SCD 2: 8 3: INPE-8 4: CEA 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais 18: Solar radio proposal 40: Pt 41: Pt 42: 58: CEA 64: Dec. <1963> 66: Sao Jose dos Campos 67: BR 68: RPQ MFN: 1416 91: FDB-19940119 92: FDB-MLR 101: D 58: CEA 62: INPE 64: Dec. <1963> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 83: This summary is merely a catalogue of reduced riometer data obtained during the initial period of observations from March 16 through August 31, 1963 at Sao Jose dos Campos. We will not attempt here to reach any conclusions. This will be done in a paper which will follow. This summary will also show (Fig. 1)a "quiet-day" curve, for the SJC station which was obtained from the avaiable data of the period under consideration. The dotted part of the "quiet-day" curve indicates that section of the curve which will need future corrections for errors that became apparent while reduction of the riometer data was performed in terms of daily absorption. For each month, the value of absorption is tabulated for the first minute of each hour to the nearest 0.05 db, and the total number of readings for the month as well as the median value are indicate in the same table. See for instance Tables II through XIII. Note that Fig.2 also shows the monthly medians mentioned above. A listing of the registered solar flares and related absorption effects during the period under consideration is shown in the Table I. Figure 3 shows a disturbed record where the effect associated with a solar flare on the cosmic noise absorption is quite evident 18: Absorption measurements with riometer data summary for the period March through Aug., 1963 20: 22 40: En 41: En 42: 1: SID/SCD 2: 9 3: INPE-9/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Sette, M. A. 16: Mendonca, Fernando de MFN: 1417 1: SID/SCD 2: 10 3: INPE-10/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Muzzio, J.L.R 18: Computation of group velocities in the ionosphere 20: 26 40: Pt 41: Pt 42: 58: CEA 62: INPE 64: Marc. <1964> 66: Sao Jose dos Campod 67: BR 68: RPQ 90: b 83: In a very interesting paper G. Millington (1938)developed simple mathematical formulas for the calculation of group velocity, group path and attenuation of electromagnetic waves in the ionosphere. The formulas are based upon some polynomials in terms of X, Y and (the well known variables of magneto-ionic theory). It was a long and very elegant mathematical work, but the author calculated group velocities for some particular values of and Y only, in order to exemplify his method. Later, Shinn and Whale (1952), in a paper which has been frequently referenced, developed somewhat different formulas for the calculation of group velocities and group heights and plotted curves of the group refractive index as a function of X and Y, for one particular value of (that of South east England). In a more recent paper, R.F. Mullaly (1956), working on the formulas of Shinn and Whale, made some simplification in its form by introducing a new parameter =1+X/( -1). The idea of Mullaly was to simplify the calculation procedure in order to use desk calculating machines. Nevertheless the expressions developed by Millington are more easily adapted for the calculation of other parameters such as absorption and path length and use will be made of them in the present work 91: FDB-19940119 92: FDB-MLR 101: D MFN: 1418 91: FDB-19940119 92: FDB-MLR 101: D 83: An attempt has been made in order to establish a correlation between observed bursts at Boulder on the range of 8 - 41 Mc/s and riometer records at Sao Jose dos Campos, Brazil, in 30 Mc/s. Fourteen cases of type III burst, excepting those of importance 1, have been analysed to determine the correlation coefficient between the logarithm of the power arriving at the antenna due to the burst and the secant of the solar zenith angle . The coefficient r = -0.91 shows the influence of the optical depth of the lower level of the ionosphere (and possible antenna beamwidth)on the received power during the burst. The estimate flux density for the solar radiation is in very good agreement with the limits observed at Boulder. An example is presented of interesting features of events, such as flares and intense associated bursts of type II, III, IV, and "continuum" as shown on the riometer records 1: SID/SCD 2: 11 3: INPE-11/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Radicella, S. M. 16: Sette, M.A 58: CEA 59: MIRO 62: INPE 64: Mar. <1964> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 18: Effects of solar radio bursts on riometer records at 30 Mc/s 20: 11 40: En 41: En 42: MFN: 1419 1: SID/SCD 2: 12 3: INPE-12/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Sette, M.A. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary for the period September through December 1963 20: 18 40: En 41: En 42: 58: CEA 62: CNAE 64: MAY <1964> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 111: Antonio D. Moura 112: CPT 120: D 113: 09.12.81 83: This summary is a catalogue of reduced riometer data for the period of observations from September 1963 through December 1963 at Sao Jose dos Campos. This summary will also show (Fig. 1)a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data of the period of April 1963 to December 1963 - nine months of regular operation. The dotted part of the "quiet-day" curve indicates that section of the curve which will need future corrections for errors that became apparent while reduction of the riometer data was performed in terms of daily absorption. For each month, the value of absorption is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median value are indicate in the same table. See for instance Tables II through IX. Note that Fig. 2 also shows the monthly medians mentioned above. A listing of the registered solar flares and related absorption effects during the period under consideration is shown in the Table I MFN: 1420 1: SID/SCD 2: 13 3: INPE-13/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Meira Filho, Luiz Gylvan 16: Mendonca, Fernando de 18: Atmospheric noise measurements data summary N. 1 20: 27 40: En 41: En 42: 58: CEA 64: May <1964> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Under the designation of Project "OBRA", one of the 16 atmospheric noise receiving stations of the world-wide net work supervised by the NBS, has been in operation at this Laboratory since August 1963. This report is intended to account for the work done under this project up to December 1963, including the transference of the whole station from its early site, repairing the equipment and collecting data. Also, the initial sections of the report outline the general problem of radio noise measurements and describe the techniques and equipment used. Data are presented as they were obtained, without any attempt to reach conclusions. This will possibly be done later 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 111: a 112: Antonio D. Moura MFN: 1421 91: FDB-19940510 92: FDB-MLR 101: D 1: SID/SCD 2: 14 3: INPE-14-LAFE 4: CEA 5: MC 6: am 7: [07] 10: Mendonca, Fernando 12: Ionospheric electron content measurements in regions of low magnetic dip angles and through the brazilian magnetic anomaly 21: 25 40: En 41: En 42: 52: COSPAR 53: International Space Science Symposium, 5 54: May <1964> 56: Florence 57: IT 58: DIR 61: 64: <1964> 68: PRE 90: b 83: Differential Doppler measurements made with harmonically related frequencies transmitted from sattelites are utilized for calculation of the latitudinal and diurnal variations of the total electron content of the ionosphere. These preliminary measurements, performed during April, 1963, with the satellite Anna-1-B, cover areas with subionospheric points from the vicinity of the magnetic equator to about -40 degrees dip, and between longitude of 35 degrees and 60 degrees W. Mainly two distinct fenomena are noticed in the ionosphere of this region. The first is that a latitudinal maximum value of the total electron content developes at the magnetic equator at sunrise and moves way toward higher dip angles for the whole day possibly due in part to diffusion in the higher ionosphere along the magnetic field lines. The second phenomenon is that there is a marked increase in electron content in the region which geographically correspondes to the area of the Brazilian anomaly of the earth's magnetic field in the South Atlantic. This enhancement in electron content is atributable to ionization caused mostly by righ energy particles of the artificial belt, which have mirroring points in levels well into the ionosphere at the magnetic anomaly MFN: 1423 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 16 3: INPE-16/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Sette, M.A. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary for the period January through March 1964 20: 14 40: En 41: En 42: 54: May <1964> 58: CEA 62: CNAE 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data for the period of observations from January 1 through March 31, 1964 at Sao Jose dos Campos. This summary will also show (Fig. 1)a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data of the period of April 1963 to March 1964 - twelve months of regular operation. The dotted part of the "quiet-day" curve indicates that section of the curve which will need future corrections for errors that became apparent while reduction of the riometer data was performed in terms of daily absorption. For each month, the value of absorption is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median value are indicate in the same table. See for instance Tables II through VII. Note that Fig. 2 also shows the monthly medians mentioned above. A listing of the registered solar flares and related absorption effects during the period under consideration is shown the Table I MFN: 1429 1: SID/SCD 2: 22 3: INPE-22-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Sette, M.A. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary N.5 for the period July through September 1964 20: 15 40: En 41: En 42: 62: CNAE 64: Oct. <1964> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observations from July through September 1964 at Sao Jose dos Campos . This summary will also show (fig.1)a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15 1963. The dotted part of the "quiet-day" curve indicates that section of the curve which will need future corrections for errors that became apparent while reduction of the riometer data was performed in terms of daily absorption. For each month, the value of absorption is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles value are indicated in the same table. See for instance Tables II through VII. Note that fig.2 also shows the monthly medians mentioned above. A listing of the registered solar flares and related absorption effects during the period under consideration is presented in the Table I 91: FDB-19940120 92: FDB-AYH 101: D MFN: 1430 1: SID/SCD 2: 23 3: INPE-23-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Meira Filho, Luiz Gylvan 16: Mendonca, Fernando de 18: Atmospheric noise measurements - data summary N.2 station ARN 2 N.10 20: 17 40: En 41: En 42: 62: CNAE 64: Jan. <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Under the designation of Project "OBRA", one of the 16 atmospheric radio noise receiving stations of the world-wide network supervised by the Boulder Laboratories, NBS, has been in operation at this Laboratory since August 1963. This report presents the data collected during the period from January to June 1964 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 110: 1 111: Antonio D. Moura 111: Antonio D. Moura 112: CPT 112: CPT 113: 09.12.81 113: 01.04.82 MFN: 1431 1: SID/SCD 2: 24 3: INPE-24-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Meira Filho, Luiz Gylvan 16: Mendonca, Fernando de 18: Atmospheric noise measurements - data summary N.3 station ARN 2 N.10 20: 29 40: En 41: En 42: 58: CEA 62: CNAE 64: July <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Under the designation of Project "OBRA", one of the sixteen Atmospheric Radio Noise Receiving Stations of the world - wide network supervised by the Boulder Laboratories, NBS, has been in operation at this Laboratory since August 1963. This report presents the data collected during the period July - 64 - June 1965 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 110: 1 111: Antonio D. Moura 111: Antonio D. Moura 112: CPT 112: CPT 113: 09.12.81 113: 01.04.82 MFN: 1432 1: SID/SCD 2: 25 3: INPE-25/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Meira Filho, Luiz Gylvan 18: Estudo de fenomenos na baixa ionosfera atraves de ruido atmosferico em VLF -trabalho individual de graduacao 20: 123 40: Pt 41: Pt 42: 58: CEA 59: OBRA 62: CNAE 64: dez. <1964> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Este e um relatorio preliminar sobre um metodo pratico para o estudo de fenomenos associados a baixa ionosfera atraves do ruido de radio em VLF de origem atmosferica. E apresentado um exemplo da forte correlacao existente entre o ruido e a tempestade magnetica registrada em meados de julho de 1964 91: FDB-19940120 92: FDB-AYH 101: D MFN: 1434 1: SID/SCD 2: 27 3: INPE-27 4: CEA 5: MP 6: m 16: Comissao Nacional de Atividades Espaciais 18: Magnetometer 20: 13 40: En 41: En 42: 58: DGE 59: PROJETO GEOMA 62: CNAE 64: <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 91: 6507 MFN: 1435 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 28 3: INPE-28/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Sette, M.A. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary for the period October through March, 1965 20: 28 40: En 41: En 42: 58: CEA 62: CNAE 64: July <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observations from October 1964 through March 1965. Equipment failure occurred during the months October and November, so that, no absorption data is available for those months. This summary will show (fig. 1)a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the value of absorption is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles value are indicated in the same table. See for instance Tables II through IX. Note that fig.2 also shows the monthly medians mentioned above. A listing of the registered solar flares bursts, and related absorption effects during the period under consideration is presented in the Table I MFN: 1436 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 29 3: INPE-29/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Muzzio, J.L.R. 18: A limitation method for the reduction of topside ionograms using the phase refractive index 20: 13 40: En 41: En 42: 58: CEA 62: CNAE 64: July <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: The purpose of this paper is to present a lamination method for the reduction of top - side ionograms using the phase refractive index. The method in question follows after the works of Hojo (1961)and Titheridge (1963), and has some advantages over the more elaborated polinomial methods with regard to the time of computation and memory capacity of required computers. It is specially suited for a small capacity computer like the IBM 650 or the IBM 1620. The final accuracy of the results is comparable to the above mentioned methods as will be seen by some examples MFN: 1437 1: SID/SCD 2: 30 3: INPE-30-LAFE 4: CEA 5: MC 6: am 7: [07] 11: Instituto de Pesquisa Espaciais 12: Second circular 40: En 41: En 42: 53: International Symposium on Equatorial Aeronomy, 2 54: 6-17 Sept. <1965> 58: CEA 61: 64: <1965> 68: PRE 90: b 83: Abstracts for the review papers that begin the session (200 words)when appropriate, and those for the presentation of recent results (100 words), will be mimeographed and distributed upon their submission to the Scientific Program Committee via the Secretariat. For the short abstracts, a session should be recommended by the contributor 91: FDB-19940510 92: FDB-MLR 101: D MFN: 1438 1: SID/SCD 2: 31 3: INPE-31 4: CEA 5: MP 6: m 17: Comissao Nacional de Atividades Espaciais 18: SISEA - Third circular 40: En 41: En 58: DGE 59: PROJETO ALTA ATMOSFERA 62: INPE 64: <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: GEOFISICA ESPACIAL 91: 6508 MFN: 1440 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 33 3: INPE-33/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Comissao Nacional de Atividades Espaciais 18: Second international symposium on equatorial aeronomy - circular on publications 40: En 41: En 42: 58: CEA 59: RASA 62: CNAE 64: Oct. <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ MFN: 1441 91: FDB-19940120 92: FDB-AYH 101: D 58: CEA 59: SAFO 62: CNAE 64: nov. <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: O presente relatorio contem os elementos do "plano de voo"para o lancamento de dois foguetes de sondagem ionosferica a serem realizados na Estacao de Lancamento de Ponta Negra do Ministerio da Aeronautica, localizada nas proximidades do equador magnetico, no Rio Grande do Norte. Estes serao os primeiros lancamentos de uma serie a ser realizada em Natal dentro do Projeto SAFO que e baseado num termo de colaboracao entre o goCNAE e a NASA dos Estados Unidos. O primeiro lancamento do projeto em apreco foi executado em 24 de agosto de 1965 com pleno sucesso na Estacao de Wallops Island (NASA)por equipe brasileira em fase de treinamento. No Brasil o Projeto SAFO e executado por meio de um acordo entre o Conselho Nacional de Pesquisas e o Ministerio da Aeronautica. O CNPq atraves do Laboratorio de Fisica Espacial do Grupo de Organizacao da Comissao Nacional de Atividades Espaciais (CNAE), prove foguetes, equipamentos, instrumentacao e orientacao dos trabalhos tecnicos cientificos. O Ministerio da Aeronautica executa os lancamentos utilizando suas instalacoes na Barreira do Inferno construidas especificamente para estes fins. A tripulacao de lancamento que fora treinada na NASA sob os auspicios da CNAE, e integrada em sua maioria por elementos do Grupo de Trabalho e Estudos de Projetos Especiais (GTEPE)do Estado Maior da Aeronautica, e por elementos da CNAE. Alem de experimentos ionosfericos, o Projeto SAFO e constituido tambem de uma parte de lancamentos de foguetes meteorologicos. Os lancamentos de foguetes meteorologicos serao inicialmente quinzenais a partir de 15 de janeiro de 1966, e serao executados em coordenacao com a CNIE, (Argentina)e NASA (E.U.A)dentro do programa internacional da Cadeia Interamericana de Lancamentos de Foguetes de Sondagem Meteorologica (EXAMETNET) 1: SID/SCD 2: 34 3: INPE-34/LAFE 4: CEA 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais 18: Projeto SAFO: Plano de voo 20: 18 38: Plano de voo para o lancamento de dois foguetes de sondagens ionosfericas do tipo Nike-Apache em dezembro de 1965 em Natal 40: Pt 41: Pt 42: MFN: 1442 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 110: 1 111: Antonio D. Moura 111: Avibras - Ind. Aeroespacial 112: CPT 113: 09.12.81 113: 08.08.84 1: SID/SCD 2: 35 3: INPE-35/LAFE 4: MET 5: MP 6: m 7: [07] 17: Comissao Nacional de Atividades Espaciais. Laboratorio de Fisica Espacial 18: Climatological Data for the Sounding Rocket Station at Natal - Barreira do Inferno 20: 57 40: En 41: En 42: 58: DME 59: EXAME 62: INPE 64: nov. <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 76: METEOROLOGIA 83: The series of climatological tables and graphs presented herein are based on 10 years (1954-1963)of weather observations at Natal Brazilian Air Force Base (05 54'S and 35 15'W). The raw data was furnished by the "Diretoria de Rotas Aereas" of the Ministerio da Aeronautica. The data reduction for the tables was performed at CNAE by U. Belcufine (1 Ten Met)of GTEPE, Manuel C. de Moura (S.O. Met.)and Liraucio Bonaz (1 S Met)of the Servico de Rotas (SR-4), 4a. Zona Aerea - M. Aer. - Sao Paulo. We gratefully acknowledge all their collaboration. The tables on this report appear in a similar order of presentation on the United Nations Doc. A/AC. 105/10 (Committee on the Peaceful Uses of Outer Space): "Manual Prepared by the INCOSPAR on the Thumba Equatorial Souding Rocket Launching Site" (India). Thus it will be easy to compare the climatological informations on both launching sites, namely Thumba in India and Natal - Brazil. At a later date this preliminary report will be part of a full report being prepared about the first Brazilian Sounding Rocket Station MFN: 1444 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 38 3: INPE-38/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Comissao Nacional de Atividades Espaciais 18: Absorption measurements with riometer data summary N.1 for the perios April through September, 1965 20: 35 40: En 41: En 42: 58: CEA 59: MIRO 62: CNAE 64: Nov. <1965> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observations from April 1965 through September 1965. Figure I shows a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the value of observation is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance Tables IV through XV. Note that Figs. II and III also show the monthly medians mentioned above. Table I shows a listing of important flares which occurred under sunlight periods for the station, whereas the Table II contains all burst under sunlight period as published by H.A.O. - Boulder (Colorado). The absorption events at the Riometer of Sao Jose dos Campos are listed in the Table III carrying time interval and maximum value of absorption MFN: 1445 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 40 3: INPE-40/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Scarabicci, R.R. 16: Mendonca, Fernando de 18: Phase measurements of VLF transmissions over a 11000 km transequatorial path 20: 41 40: En 41: En 42: 58: CEA 62: CNAE 64: Jan. <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Phase measurements of 18.6 kHz Jim Creek's transmissions were recorded during 1964 and 1965 at Sao Jose dos Campos (SP), Brazil. The diurnal signal phase variation presents an average time shift delay of 80 , which is rather regular throught the year. Observations of solar flare effects during the period were utilized to determine the product N of the effective recombination coefficient and electron density at the reflection height. The value of 5.0x10 s obtained for the product is approximately constant for all observed flares. The behavior of the phase rate of change during sunrise and sunset is discussed in terms of the interference pattern of propagation modes and in terms of the angle between the sunrise (and sunset)line and the transmitter-receiver great circle path. Experimental evidence permits one to conclude that the phase-path reflection height is a strong controlling factor of the second order mode propagation. Observations also show that the angle mentioned above is an important parameter in VLF phase studies MFN: 1446 1: SIOD/SCD 2: 41 3: INPE-41/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Mendonca, Fernando de 16: Meira Filho, Luiz Gylvan 18: Equatorial nighttime e - region ionization sources 20: 15 40: En 41: En 42: 58: CEA 59: SAFO 62: CNAE 64: April <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Two Nike-Apache rockets were launched from a new site (5.6 S and 35.2 W)close to the magnetic equator in the vicinity of Natal, Brazil. The first launching took place at 19.19UT and the second one at 04.59UT, on December 15 and 18, 1965. This note presents some of the results obtained by means of measurements of H Lyman lines and positive ion profiles. It is shown that the nighttime E region is produced in two levels separated by a deep valley. The lower part in the range 95-130Km is maintained by ionization produced by the flux of scattered H Ly- and - which have production peaks at about 104 and 110Km respectively. The higher part of the nighttime region, merging with the region, has the contribution of the ionization due to H Ly- and - . The contents of this note are to be presented at the 7th. COSPAR Symposium in Vienna, Austria, on May 1966 and will be submitted for publication as a Letter to the Editor to the Journal of Geophysical Research 91: FDB-19940120 92: FDB-AYH 101: D MFN: 1447 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 42 3: INPE-42/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Lunetta, M. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary N.8 for the period October through December, 1965 20: 23 40: EN 41: En 42: 58: CEA 59: M 62: CNAE 64: April <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observations from October 1965 through December 1965. Figure 1 shows a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the value of observation is tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance Tables IV through IX. Note that Fig.2 also shows the monthly medians mentioned above. Table I shows a listing of important flares which occurred under sunlight periods for the station, whereas the Table II contains all burst under sunlight period as published by H.A.O. - Boulder (Colorado). The absorption events at the Riometer of Sao Jose dos Campos are listed in the Table III carrying time interval, maximum value of absorption, and maximum variation about cosmic noise level MFN: 1448 1: SID/SCD 2: 43 3: INPE-43/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Meira Filho, Luiz Gylvan 16: Seixas, P.I. 18: Lower ionosphere payloads for sounding rockets I-instrumentation 20: 80 40: En 41: En 42: 58: CEA 59: SAFO 62: CNAE 64: July <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Esta e a primeira parte do relatorio tecnico que descreve pormenorizadamente as cargas uteis usadas em nossos lancamentos no ano passado e que foram desenvolvidas no Centro de Voo Espacial de Goddard GSFC pelo grupo do Sr. R. E. Bourdeau. Tres cargas semelhantes foram construidas por engenheiros brasileiros (L.G.Meira Jr. e P.I.Seixas)sob a direcao do Sr. G. Spaid. A construcao destas cargas constitui uma das partes do primeiro programa de lancamento de foguetes Projeto Safo realizado atraves de um Memorando de Entendimento entre a NASA e a CNAE. Os lancamentos de tres foguetes Nike-Apache com as mencionadas cargas foram realizados respectivamente em Wallops Island (24 de agosto de 1965)e Barreira do Inferno (15 e 18 de dezembro de 1965). Estes foram os primeiros lancamentos efetuados do novo campo nas proximidades do equador magnetico. Todos os tres lancamentos foram realizados com sucesso, e os resultados preliminares dos experimentos foram apresentados no Simposio do Comite Internacional de Pesquisa Espacial (COSPAR)em Viena em maio do corrente ano. Um relatorio completo com todos os resultados obtidos esta sendo preparado por F. de Mendonca, L. G. Meira Jr., R. Bourdeau e L. Blumle. Cargas uteis semelhantes as descritas neste relatorio estao sendo confeccionadas nos laboratorios da CNAE para serem usadas por ocasiao do proximo eclipse total do sol no Rio Grande do Sul em 12 de novembro de 1966 e posteriormente em Natal com o objetivo principal de se fazer medidas do fluxo de energia nas raias do helio no ceu noturno. O proposito de se imprimir este relatorio e facultar a novos grupos como o nosso a possibilidade de iniciarem pesquisas com foguetes de sondagens aeronomicas e tambem prover aos leitores do relatorio cientifico associado mais informacoes de como as medidas foram feitas e com que tipo de instrumentacao. Finalmente informamos que investigadores desejosos em participarem do nosso programa de pesquisas com foguetes de sondagens sao cordialmente convidados a nos escreverem diretamente para informacoes adicionais 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 110: 1 111: Antonio D. Moura 111: Antonio D. Moura 112: CPT 112: CPT 113: 12.01.82 113: 01.04.82 MFN: 1449 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 45 3: INPE-45/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Lunetta, M. 16: Mendonca, Fernando de 18: Absorption measurements with radiometer data summary N.9 for the period January through June 1966 20: 49 40: En 41: En 42: 58: CEA 59: MIRO 62: CNAE 64: Aug. <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data for the period of observations from January through June 1966. Figure I shows a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the values of the observations are tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance Tables V through XVI. Note that Figs. 2 and 3 also show the monthly medians mentioned above. Table I shows a listing of important flares which occurred under sunlit periods for the station, whereas the Tables II and III contain all burst and SCNAs respectively under sunlight period as published by H.A.O. - Boulder (Colorado). The absorption events measured at Sao Jose dos Campos are listed in the Table IV carrying time interval, maximum value of absorption, maximum variation about cosmic noise level, and eventual flare to which there is correlation. The figures 4, 5, 6, 7, 8 show five portions of riometer records registered at the Sao Jose dos Campos station during time intervals containing 5 important solar flares and associated events MFN: 1451 91: FDB-19932201 92: FDB-MD 101: D 110: 1 110: 1 111: Antonio D. Moura 111: Avibras - Ind. Aeroespacial 112: CPT 113: 12.01.82 113: 08.08.84 1: SID/SCD 2: 47 3: INPE-47/LAFE 4: MET 5: MC 6: am 7: [07] 10: Salgado, J.A.M. 10: Belcufine, Ulisses 10: Tedesco, M. Del 10: Mendonca, Fernando de 12: Meteorological Sounding Rocket Program at Natal 14: 58 18: Status Report to the Executive Committee Meeting 40: En 41: En 42: 53: Annual EXAMETNET Meeting, 1 54: Sept. <1966> 56: Ascochinga 57: AR 58: DME 59: EXAME 61: 62: INPE 64: <1966> 68: PRE 90: b 76: METEOROLOGIA 83: In a meeting in August 1965 in Wallops Station in Wallops Island, Virginia U.S.A. Brazil accepted the responsibility of making a series of meteorological rockets lauchings fulilling the proposed EXAMETNET program (Experimental Inter-American Meteorological Rocket Network). This program would consist primarily of 15 firings during 1966 of MASP (Instrumented or Chaff)and ARCAS (instrumented)rockets which selection would depend on the present availability. The lauching dates were chosen in accordance with the International Geophysical Calendar and following a plan suggested during the meeting. Since a meteorological sounding rocket was being developed in Brazil it was also mentioned the possibility of increasing the frequency to a 30 rockets per year schedule during 1966. The final decision in Brazil was to try to keep this 30 firings plan as far as possible during 1966. We have however encontered some difficulties with rocket procurement. The operational phase for the Brazilian meteorological rocket has not been reached yet as of the date of this report MFN: 1452 1: SID/SCD 2: 48 3: INPE-48/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Amarante, J.A.A. 18: Topicos gerais sobre geomagnetismo e estudo sobre a ocorrencia de micro-pulsacoes em Sao Jose dos Campos 20: 187 40: Pt 41: Pt 42: 58: CEA0 64: julho <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: No tratamento teorico preliminar (Parte I)da fenomenologia associada ao magnetismo terrestre, procuramos dar enfase especial ao aspecto descritivo. O tratamento matematico e deixado para o leitor, no futuro, apos ter ele se familiarizado com o que hoje se conhece sobre geomagnetismo. Na parte experimental que se segue, foi feita uma investigacao intensiva sobre as particularidades da ocorrencia de micropulsacoes em Sao Jose dos Campos, usando-se magnetogramas do ano 1965. Houve particular dificuldade na identificacao das pc's em vista das pequenas amplitudes a esperar em nossa latitude, mas o comportamento geral delas e das pi-2 nao se afastam do padrao geral ja estabelecido por outros pesquisadores. Adicionalmente, foi feita uma analise de grupos de pulsacoes irregulares, notando-se uma tendencia de as pulsacoes individuais ocorrerem com periodos decrescentes, fato que, se explorado convenientemente, pode vir a lancar muita luz sobre as precipitacoes aurorais. Notou-se uma quase total ausencia, durante o periodo diurno, de pi-2 associadas a baia. Das pulsacoes associadas a baias, 39 ocorreram simultaneamente com as mesmas e 39 as precederam, havendo uma maior incidencia naquelas com 12 a 20 minutos de antecedencia; nenhuma pi-2 surge apos 11 minutos de inicio de baia, confirmando a hipotese de que tanto as pi-2 quanto as baias sejam causadas por precipitacao aurorais de particulas carregadas. Um detalhe, em particular, foi examinado com cuidado e permitiu serem colhidas fortes evidencias a favor do incremento de barreira hidromagnetica nas epocas de maior atividade solar. Este detalhe foi a ocorrencia de minimos solsticiais de tamanhos desiguais na variacao anual das pc-4, que, complementado com informacoes sobre a variacao de densidade eletronica na camada F2 (referencia 70)e com a variacao anual da ocorrencia de erupcoes solares (Parte IV), nos permitiu salientar as evidencias acima referidas em favor da teoria atual sobre a barreira HM 91: FDB-19940120 92: FDB-AYH 101: D MFN: 1454 91: FDB-19940120 92: FDB-AYH 101: D 1: SID/SCD 2: 51 3: INPE-51/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Guimaraes, B.I.P. 16: Iisuka, K. 18: Modelos estatisticos da ionosfera 20: 73 40: Pt 41: Pt 42: 58: CEA 59: RASA 62: CNAE 64: nov. <1966> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Este trabalho procura estabelecer modelos estaticos da ionosfera, a partir de consideracoes puramente teoricas. Partindo das suposicoes de Chapman, chegaram os autores a expressao que fornece a razao de fotoionizacao de um gas neutro, quando sujeito a acao de radiacao solar de determinado comprimento de onda. Devido ao numero elevadissimo de operacoes necessarias a obtencao dos resultados desejados, os calculos foram realizados no Laboratorio de Processamento de Dados da CNAE, atraves do computador eletronico IBM-650. Os resultados foram plotados em graficos, com consequente perda de precisao, mas, ganho em visao de conjunto MFN: 1455 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 110: 1 111: Hulda o. de Carvalho 111: Otto Grimolizzi 112: DBD 113: 13.10.81 113: 01.03.77 1: SID/SCD 2: 52 3: INPE-52/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Waldman, H. 18: Estudo das variacoes do conteudo eletronico na ionosfera por meio do efeito faraday 20: 50 40: Pt 41: Pt 42: 58: CEA 59: SONDA 62: CNAE 64: jan. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: O presente trabalho trata do comportamento do conteudo eletronico de ionosfera nas proximidades da estacao receptora da CNAE, em Sao Jose dos Campos. Inicialmente, e feita uma introducao teorica que mostra os fundamentos fisicos das medidas realizadas. Em seguida, sao estudadas as medidas propriamente ditas, suas limitacoes, e os procedimentos corretivos utilizados. Finalmente, e feita a analise dos resultados obtidos, sempre que possivel tentando interpretar o comportamento observado segundo os modelos da ionosfera mais acreditados atualmente MFN: 1456 91: FDB-19940120 92: FDB-AYH 101: D 110: 1 111: Hulda 112: DBD 113: 25.11.76 1: SID/SCD 2: 53 3: INPE-53/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Machado, L.C.M. 18: Simulacao 20: 127 40: Pt 41: Pt 42: 58: CEA 59: DPD 62: CNAE 64: jan. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: The paper is divided into two main parts. The first one is an introduction to digital simulation techniques and a classification of basic. Simulation-problems: Flow systems and Production Systems. Methods of generating stochastic variables (A Pseudo-Randon Number Generation)are also discussed. The second part includes an introduction to Simulation Languages, a comparative study of general purpose languages (FORTRAN-AFIT)a special purpose language (IBM's GPSS-II with an example problem)and a new semi-automatic language for the IBM-1620 Digital Computer - LESS. This new language provides easy access to the system and a possibility of executing the source-program itself without the compilation passes. The concept of "PHRASE" and a chance of program-modification without a new pass is one of the advantages of the system. A new technique for solving simulation problems is described with illustrative examples. A User's Manual as well as Characteristics Manual are included as supplements MFN: 1457 1: SID/SCD 2: 54 3: INPE-54/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Lunetta, M. 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary N.10 for the period July through December, 1967 20: 90 40: En 41: En 42: 58: CEA 59: MIRO 62: CNAE 64: Feb <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 91: FDB-19940125 92: FDB-AYH 101: D 83: This summary is a catalogue of reduced riometer data, for the period of observations from July through December 1966. Figure 1 shows a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the values of the observations are tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance Tables V through XVI. Note that Figs.2 and 3 also show the monthly medians mentioned above. Table I shows a listing of important flares which occurred under sunlit periods for the station, whereas the Tables II and III contain all burst and SCNAs respectively under sunlight period as published by H.A.O. - Boulder (Colorado). The absorption events measured at Sao Jose dos Campos are listed in the Table IV carrying time interval, maximum value of absorption, maximum variation about cosmic noise level, and eventual flare to which there is correlation. The figures 4 through 13 show ten portions of riometer records registered at the Sao Jose dos Campos station during time intervals containing important solar flares and associated events MFN: 1458 59: MIRO 62: CNAE 64: julho <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 91: FDB-19940125 92: FDB-AYH 101: D 83: O presente guia foi elaborado com a finalidade de orientar os pesquisadores responsaveis pela analise de magnetogramas fornecendo-lhes os elementos essenciais para a identificacao e classificacao das variacoes magneticas rapidas. Os exemplos que serao apresentados se referem a fenomenos nas latitudes medias; a aparencia dos mesmos nas regioes polares e equatoriais pode ser inteiramente diferente. A nomenclatura usada foi mantida rigorosamente de acordo com as recomendacoes do Comite Especial No. 10 de I.A.G.A.. Entretanto, a folha de registro que adotaremos em nosso observatorio e mais detalhada que aquela adotada internacionalmente, conforme e facil observar atraves da comparacao feita entre as reproducoes das mesmas apresentadas a seguir. Antes de se entrar na analise detalhada do preenchimento de cada tabela, apresentar-se-a algumas observacoes de carater geral. a- Todas as indicacoes de hora sao dadas na escala universal (G.M.T.)b- A classificacao de qualidade dos fenomenos obedecera a um julgamento obviamente subjetivo, mas que devera obedecer as diretivas abaixo: A- fenomeno especialmente claro, com todas as suas caracteristicas tipicas bem evidentes (BASTANTE NITIDO). B- fenomeno com razoavel nitidez, mas ao qual faltem certas caracteristicas (ORDINARIO). C- fenomeno que so grosseiramente possua as peculiaridades que o caracterizam como tal (POUCO CLARO). c- As amplitudes sao dadas todas em gammas e os periodos em segundos 1: SID/SCD 2: 55 3: INPE-55/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Amarante, J.A.A. 18: Guia para a identificacao e classificacao das variacoes geomagneticas de curta duracao 20: 34 40: Pt 41: Pt 42: MFN: 1459 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 111: Otto Gromollizzi 113: 03.03.77 1: SID/SCD 2: 56 3: INPE-56/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Almeida, O.G. 16: Waldman, H. 18: Total electron content measurements by differential faraday rotation method at low latitudes 20: 71 40: En 41: En 42: 59: RASA 62: CNAE 64: April <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Extensive measurements of electron content have been made all over the world with the use of beacon frequencies of artificial satellites. This report presents one more set of measurements of this kind, with the purpose of understanding the ionospheric processes in our latitudes at the time of a minimum of the solar cycle. Satellite S-66-B was used for measurements of Faraday rotation angles for two closely spaced frequencies (40 and 41 Mhz), as well as Doppler shifts. Computer programs and data reduction routines were established in order to evaluate the total electron content as measured from our station in Sao Jose dos Campos. A technique of closely spaced frequencies provides a simple method for application of the correction to the second-order effects over the Faraday rotation angle. The satellite motion across the region of quasi-transversal propagation strongly affects the accuracy of measurements, however we where able to eliminate this unwanted effect by a smoothing technique. The analysis was made with special attention given to total electron content variations associated with local time, equatorial anomaly and Brazilian magnetic anomaly MFN: 1460 91: FDB-19940125 92: FDB-AYH 101: D 1: SID/SCD 2: 57 3: INPE-57/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Amarante, J.A.A. 18: Um metodo para a determinacao da atitude de foguetes em voo livre atraves do uso de sensores magneticos 20: 42 40: Pt 41: Pt 42: 59: SAFO 62: CNAE 64: ago. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: E feita uma analise sobre o uso de sensores magneticos para a determinacao da atitude de um foguete longitudinalmente simetrico e em "voo livre", portanto com precessao e "spin" uniformes. Apos uma analise matematica inicial da rotacao, efetuada com a ajuda dos angulos de Euler, obtem-se uma equacao para o sinal de saida do magnetometro do sensor. Esta equacao sofre uma simulacao analogica, sendo tracadas curvas para alguns valores do angulo de precessao, da inclinacao do eixo de precessao em relacao ao campo magnetico local, do angulo de montagem do sensor e das frequencias de precessao e "spin". Um metodo para a obtencao do angulo de precessao e do angulo de inclinacao do eixo de precessao em relacao ao campo geomagnetico, a partir da interpretacao da envoltoria do sinal de saida, e apresentado com minucias. As varias curvas obtidas da simulacao analogica sao, a seguir, cuidadosamente analisadas, fornecendo elementos para as informacoes prestadas sobre a melhor escolha da posicao e numero dos sensores. Faz-se mencao especial ao problema de lancamentos equatoriais, para os quais sao apresentadas sugestoes especificas. Finalizando, e feito um sumario dos procedimentos a serem usados tanto na analise previa quanto na interpretacao dos resultados MFN: 1461 1: SID/SCD 2: 58 3: INPE-58/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Taveira, W.S. 16: Mendonca, Fernando de 18: Atmospheric noise measurements - data summary N.4 - station ARN 2 - N.10 20: 27 40: En 41: En 42: 59: OBRA 62: CNAE 64: Jul. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Under the designation of Project "OBRA", one of the sixteen Atmospheric Radio Noise Receiving Stations of the world-wide network coordinated by the Environmental Science Services Administration, has been in operation at this Laboratory since August 1963. This report presents the data collected during the period July-65 June 1966 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1462 1: SID/SCD 2: 59 3: INPE-59/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Mendonca,Fernando de 16: Costa, Jos‚ Marques da 18: Geomagnetic measurements at Sao Jose dos Campos - data summary for the period July 1964 through June 1967 and final report on grant AR AFSORS-654 20: 133 40: En 41: En 42: 59: MATE 62: CNAE 64: July <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: GEOFISICA ESPACIAL 83: This is a final report for Grant AF-AFOSR-654-64 and also includes the research in geomagnetism (Project MATE)at our laboratory until 30 June 1967. The project began in July 1964, with measurements of the total geomagnetic field intensity utilizing a Varian X-4936 Optical Pumping Rubidium Vapor Magnetometer at S. Jose dos Campos, obtained from AFCRL through Grant AF-AFOSR-654-64, that expired on June 30, 1967. A continuation grant AF AFOSR-654-67 covering the period July ist, 1967 until May 1970 has been award also by USAF. A second Rubidium Vapor Magnetometer Varian X-4934 was added to the project, loaned by Standford University; this unit will be installed at Natal in the near future for providing measurements near the magnetic dip equator. The Sao Jose dos Campos station, with geographical coordinates 23 14'S and 45 51'W, stands near the center of the Brazilian Magnetic Anomaly (0.24 gauss). The interpretation of magnetograms and data processing are carried at the Space Physics Laboratory, Brazilian Space Commission (CNAE). The data are regularly reproduced in "Geophysical and Space Data Bulletins" (AFCRL), and the resultant work of the group is published internally by "LAFE Reports" (CNAE)and in international scientific periodicals 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 111: Willian Paulishak 113: 25.11.77 MFN: 1463 91: FDB-19940125 92: FDB-AYH 101: D 1: SID/SCD 2: 60 3: INPE-60/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Teracine, E.B. 18: Introducao ao estudo da natureza dos fragmentos interplanetarios 20: 34 40: Pt 41: Pt 42: 59: POEIRA 62: CNAE 64: set. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: O presente relatorio, de natureza informativa para leigos no assunto, descreve sumariamente o objetivo de um dos projetos do programa de pesquisas da CNAE. Faz parte deste projeto uma serie de lancamentos de foguetes de sondagem do tipo Nike-Iroquois (NIRO)a serem realizados no Campo de Lancamentos de Foguetes da Barreira do Inferno. Tais lancamentos serao realizados por equipe do Ministerio da Aeronautica e a recuperacao da carga util no mar sera feita com a colaboracao do Ministerio da Marinha. Em novembro de 1967 serao feitos dois lancamentos cujos objetivos sao verificar o funcionamento do sistema de recuperacao da carga e treinar as equipes participantes. Dependendo dos resultados a serem obtidos nesta verificacao, em marco de 1968 sera realizada a primeira serie de lancamentos com carga util completa. A realizacao dos lancamentos em apreco resulta de um Memorando de Entendimentos celebrado entre a National Aeronautics and Space Administration (NASA)dos Estados Unidos e a Comissao Nacional de Atividades Espaciais(CNAE)do Brasil. Os dados cientificos resultantes serao analizados pelos cientistas do Air Force Cambridge Research Laboratories e por cientistas brasileiros MFN: 1464 91: FDB-19940125 92: FDB-AYH 101: D 1: SID/SCD 2: 61 3: INPE-61/LAFE 4: CEA 5: MP 6: m 7: [07] 16: D'Oliveira, Carlos Alberto Almeida 16: Mendonca, Fernando de 18: Absorption measurements with riometer data summary N.11 for the period January 1967 through June 1967 20: 75 40: En 41: En 42: 59: MIRO 62: CNAE 64: Oct. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observations from January through June 1967. Figure 1 shows a "quiet-day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the values of the observations are tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance Tables V through XVI. Note that Figs.2 and 3 also the montly medians mentioned above. Table I shows a listing of important flares which occurred under sunlit periods for the station, whereas Tables II and III contain all burst and SCNAs respectively under sunlight period as published by H.A.O. - Boulder (Colorado). The absorption events measured at Sao Jose dos Campos are listed in Table IV carrying time interval, maximum value of absorption, maximum variation about cosmic noise level, and eventual flare to which they are correlated. The figures 4 through 8 show five portions of riometer records registered at the Sao Jose dos Campos station during time intervals containing important solar flares and associated events MFN: 1465 91: FDB-19932201 92: FDB-MD 101: D 110: 2 110: 1 111: Antonio D. Moura 111: AVIBRAS 112: DME 112: Sao Jose dos Campos 120: D 120: D 113: 12-01-82 113: 01-04-84 1: SID/SCD 2: 62 3: INPE-62/LAFE 4: MET 5: MC 6: am 7: [07] 10: Salgado, J.A.M. 10: Belcufine, Ulisses 10: Girardi, C. 10: Tedesco, M.Del 10: Mendonca, Fernando de 12: Meteorological Sounding Rocket Program at Natal 14: 95 18: Status Report to the Executive Committee 40: En 41: En 42: 53: Annual EXAMETNET Meeting, 2 54: Oct. <1967> 56: Sao Jose dos Campos 57: BR 58: DME 59: EXAME 61: 62: INPE 64: <1967> 68: PRE 90: b 76: METEOROLOGIA 83: In a meeting in August 1965 in Wallops Island Station, the Comission Nacional de Investigaciones Espaciales (CNIE)of Argentina, the Comissao Nacional de Atividades Espaciais (CNAE)of Brazil and the National Aeronautics and Space Administration (NASA)of the United States decided to establish a program of meteorological research with sounding rockets. This program, named Experimental Inter-American Meteorological Rocket Network (EXAMETNET)started in Brazil on 12 January 1966. During the period 12 January through 17 August of 1966 there were 15 launchings of HASP and ARCAS rockets including two failures. The preliminary results of these experiments were reported in the EXAMETNET's meeting at Ascochinga (Argentina)on September 1966. From 14 September 1966 through 13 September 1967 there were only 17 launchings of meteorological sounding rockets from Barreira do Inferno at Natal. These soundings are reported herein for presentation at the EXAMETNET's meeting of 23-27 October 1967 to take place at CNAE in Sao Jose dos Campos (SP)Brazil. Difficulties with procurement precluded us from executing a more frequent schedule of operations MFN: 1466 91: FDB-19932201 92: FDB-MD 101: D 114: NAO HOUVE DISTRIBUICAO DESTA PUBLICACAO 1: SID/SCD 2: 63 3: INPE-63/LAFE 4: MET 5: PM 6: m 7: [07] 16: Jino, M. 16: Kyukawa, M 18: Metodos de reducao e processamento de dados de foguetes de sondagem 20: 62 40: Pt 41: Pt 42: 58: DME 59: SAFO 62: INPE 64: dez. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 90: b 76: METEOROLOGIA 83: Neste relatorio procuramos mostrar como se faz a reducao de dados de experiencias com foguetes, deixando a analise de resultados e as conclusoes para estudos posteriores. Os dados utilizados foram obtidos de dois lancamentos feitos no programa de colaboracao CNAE/NASA no Campo de Lancamentos de Foguetes da Barreira do Inferno, Natal, Rio Grande do Norte, nos dias 15 (lancamento diurno)e 18 (lancamento noturno)de dezembro de 1965(Projeto SAFO-1). Esses lancamentos constituiram os primeiros experimentos para estudos de parametros ionosfericos com foguetes no Brasil. Os programas de computacao feitos na Secao de Computacao da CNAE para calculos de trajetoria e de densidade de ions positivos, foram incluidos no Apendice do presente relatorio para melhor compreensao da reducao de dados MFN: 1467 1: SID/SCD 2: 65 3: INPE-65/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Martin, Inacio Malmonge 16: Lourenco, J.S. 16: Costa, Jos‚ Marques da 16: Amarante, J.A.A. 16: Mendonca,Fernando de 18: Geomagnetismo - notas de aula - cursos FIS-272 - astrofisica I 20: 227 40: Pt 41: Pt 42: 59: MATE 62: CNAE 64: <1965> 66: Sao Jose dos Campos 67: BR 68: PUD 76: GEOFISICA ESPACIAL 83: Este trabalho consiste de notas de aulas dadas tomadas do curso de pos-graduacao, Introducao a Astrofisica I, ministrado na CNAE no primeiro semestre de 1965. Queremos com isto procurar facilitar o estudo e a pesquisa bibliografica em futuros cursos a serem ministrados 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1469 91: FDB-19940125 92: FDB-AYH 101: D 1: SID/SCD 2: 68 3: INPE-68/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Melo, A.B. 18: Projeto de magnetometro a precessao nuclear 20: 31 40: Pt 41: Pt 42: 59: MATE 62: CNAE 64: nov. <1967> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: Este trabalho tem o escopo principal de desenvolver um instrumento capaz de executar medidas de campo magnetico, podendo ser transportado em um foguete de modo que pudesse ser utilizado para uma experiencia no campo de lancamento da Barreira do Inferno, onde seriam medidas as correntes Sq na regiao do equador magnetico. Apesar de existirem varios metodos de obtencao destas medidas, o mais indicado para este fim e o que usa o principio da precessao nuclear livre para produzir uma frequencia analoga da intensidade do campo geomagnetico. Esta frequencia e independente da atitude do foguete. Neste trabalho faremos algumas consideracoes superficiais sobre as correntes ionosfericas, bem como sobre os principios basicos do metodo de obtencao destas medidas MFN: 1470 1: SID/SCD 2: 70 3: INPE-70-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Casali S. 16: Almeida, O.G. 16: Waldman, H. 18: Calculo do conteudo eletronico da ionosfera usando efeito faraday: reducao e processamento de dados 20: 64 40: Pt 41: Pt 42: 59: RASA 59: SONDA 62: CNAE 64: jan. <1968> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: O presente relatorio trata do processo de reducao de dados obtidos dos satelites S-66 BE-B e BE-C, de orbitas quase circulares, e o processamento dos mesmos para o calculo do conteudo eletronico colunar da ionosfera [1]. Ambos os satelites levam a bordo sistemas de transmissao CW nas frequencias de 20, 40, 41 e 360 MHz com antenas lineares. O metodo de medida da densidade colunar de eletrons baseia-se no efeito Faraday, que consiste na rotacao do plano de polarizacao da onda emitida pelo satelite ao atravessar a ionosfera. Neste relatorio estudaremos o problema aplicado aos sinais de 40 e 41 MHz. Dispondo-se de um sistema de recepcao no solo utilizando antenas lineares, observa-se o "fading" devido ao giro do plano de polarizacao da onda eletromagnetica recebida. Desse sinal, registrado em grafico, e possivel obter a variacao do angulo de giro dA onda devido ao efeito Faraday entre duas posicoes do satelite, pela contagem dos nulos do sinal no intervalo de tempo correspondente. Uma marca de tempo, dada por um sistema baseado em oscilador de alta estabilidade e precisao, e registrada no mesmo grafico. O angulo de rotacao do plano de polarizacao da onda entre dois nulos consecutivos e de muito aproximadamente radianos. A contagem do angulo de giro da onda a cada instante sera igual ao numero de nulos do sinal recebido contados a partir da posicao de referencia. No caso da estacao da CNAE de Sao Jose dos Campos, por estar localizada em regiao de baixa latitude geomagnetica, e possivel observar, na maioria das passagens dos satelites BE-B e BE-C, uma regiao de propagacao Quasi-Transversal (QT)onde o giro da onda e quasi nulo. Esse ponto e entao adotado como referencia para a contagem dos nulos de sinal 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 111: Otto Grimolizzi 113: 03.03.85 MFN: 1471 1: SID/SCD 2: 72 3: INPE-72/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Costa, Jos‚ Marques da 18: Notas sobre dispersao e velocidade de propagacao 20: 18 40: Pt 41: Pt 42: 58: DGE 59: MATE 62: CNAE 64: abril <1968> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: GEOFISICA ESPACIAL 83: Este breve estudo sobre velocidades de propagacao em meio dispersivo nao contem materia original, outrossim salientamos que seu conteudo e estritamente baseado na bibliografia referenciada, sendo seu objetivo principal fixar nocoes basicas importantes no estudo da Teoria Magneto-ionica e suas aplicacoes a ionosfera, areas de pesquisa da Comissao Nacional de Atividades Espaciais (CNAE). Somos gratos ao Dr. F. de Mendonca e ao Fis. J. Seixas Lourenco pelas sugestoes e revisao destas notas; reconhecemos tambem a presteza do pessoal da Secretaria Cientifica da CNAE 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1472 91: FDB-19940125 92: FDB-AYH 101: D 83: Under the designation of Project "OBRA", one of the sixteen Atmospheric Radio Noise Receiving Stations of the world-wide network coordinated by the Environmental Science Services Administration, has been in operation at this Laboratory since August 1963. This report presents the data collected during the period September 1966 - December 1967. The absence of data from October 1966 to April 1967 and for August 1967, is due to malfunction of the equipment on these periods 58: CEA 58: CRC 59: OBRA 62: CNAE 64: April <1968> 66: Sao Jose deos Campos 67: BR 68: RPQ 18: Atmospheric noise measurements - data summary N.5 - station ARN-2 - N.10 20: 27 40: En 41: En 42: 1: SID/SCD 2: 74 3: INPE-74/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Taveira, W.S. 16: Rozenfeld, Pawel 16: Mendonca, Fernando de MFN: 1473 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 110: 1 111: Hulda O. de Carvalaho 111: Hulda O. de Carvalho 112: DBD 112: BCO DADOS 113: 15.09.81 113: 25.11.76 83: A brief review on the behavior of the neutral atmosphere when acted on by solar radiation and the consequent formation of the ionosphere is made. A mathematical model is chosen to be representative of the ionospheric electron density profile. Using data on the total absorption suffered by radio waves which traverse the ionosphere, the electron temperature is calculated. The results thus obtained are applied to the assumed distribution and important ionospheric parameters are determined 1: SID/SCD 2: 76 3: INPE-76/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Teracine, E.B. 18: Satellite observations of the low latitudes ionosphere (PART I AND II) 20: 120 21: Part 1/2 40: En 41: En 42: 59: RASA 62: CNAE 64: Aug. <1968> 66: Sao Jose dos Campos 67: BR 68: RPQ MFN: 1474 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 110: 1 111: Hulda O. de Carvalho 111: Hulda O. de Carvalho 112: DBD 112: BCO DADOS 113: 13.01.81 113: 25.11.76 1: SID/SCD 2: 77 3: INPE-77/LAFE 4: CEA 5: T 6: m 7: [07] 16: Dias, Luiz Alberto Vieira 16: Mendonca, Fernando de 18: Considerations over the phase variation of VLF signals received at Sao Jose dos Campos - SP-BRAZIL 20: 42 50: Comissao Nacional de Atividades Espaciais 51: Mestre 62: CNAE 64: Aug. <1968> 66: Sao Jose dos Campos 67: BR 68: TDI 83: The phase variation of the signals in the band of VLF give us some information about the D region of the ionosphere. We prepared a study with the experimental data obtained at Sao Jose dos Campos, SP, Brasil (SJC)from two transmitters at different places. The location of the transmitters are Jim Creek, Washington, U.S.A. (NLK)and Trinidad (OMEGA). The diurnal variation of phase presents the same characteristics for both paths, while the seasonal variation of phase presents different behavior for the two paths. A possible reason to explain this difference is given by the difference of behavior of the seasonal ionization and loss in the different geographical latitudes of the D region. The occurence of sudden phase anomalies (SPA)is also different in the two paths. Suggestions are made to explain these features MFN: 1476 91: FDB-19932201 92: FDB-MD 101: D 110: 1 111: Antonio D. Moura 112: DME 120: D 113: 29-04-82 1: SID/SCD 2: 80 3: INPE-80/LAFE 4: MET 5: MC 6: am 7: [07] 10: Comissao Nacional de Atividades Espaciais 12: Brazilian Participation on the Exametnet program 14: 38 40: En 41: En 42: 53: Annual Exametnet Meeting, 3 54: 21-23 Oct. <1968> 56: Wallops Station 57: USA 58: DME 61: 62: INPE 63: EXAME 64: <1968> 68: PRE 90: b 76: METEOROLOGIA 83: In a meeting in August 1965, the Comission Nacional de Investigaciones Espaciales (CNIE)of Argentina, the Comissao Nacional de Atividades Espaciais (CNAE)of Brazil and the National Aeronautics and Space Administration (NASA)of United States decided to stablish a program of meteorological research with sounding rockets. This program was named Experimental Inter-American Meteorological Rocket Network (EXAMETNET). After a period used for personnel training at Wallops Station, Wallops Island, Va., those three countries started the above mentioned program in January 1966. From that date 43 launchings (10 ARCAS, 26 HASP-CHAFF and 7 HASP-INSTRUMENTED)took place at Barreira do Inferno Rocket Launching, Site, Natal, Brazil MFN: 1477 1: SID/SCD 2: 81 3: INPE-81-LAFE 4: CEA 5: T 6: m 7: [07] 16: Taveira, W.S. 16: Mendonca, Fernando de 18: Individual atmospheric and thunderstorm location from integrated atmospheric radio noise measurements 20: 56 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 59: OBRA 62: CNAE 64: Aug, <1968> 66: Sao Jose dos Campos 67: BR 68: TDI 83: A short review on some characteristics of atmospherics originated from lightning discharges is presented. The use of analysis of amplitude spectra as a tool to locate the sources is applied to experimental data on noise measurements performed at CNAE and Boulder. The results were quite consistent and agree well with weather maps indicating such centers" 91: FDB-19940125 92: FDB-AYH 101: D 110: 1 111: Hulda O. de Carvalho 112: DBD 114: 15.09.81 MFN: 1478 1: SID/SCD 2: 82 3: INPE-82-LAFE 4: MET 5: MP 6: m 7: [07] 16: Pereira, C.Solano 16: Nakamura, Y. 16: Mendonca, Fernando de 18: Absorption measurements with riometer - data summary N.12 - for the period July through December, 1967 20: 85 40: En 41: En 42: 59: MIRO 62: CNAE 64: Nov. <1968> 66: Sao Jose dos Campos 67: BR 68: RPQ 83: This summary is a catalogue of reduced riometer data, for the period of observation from July through December 1967. Figure 1 shows a "quiet day" curve for Sao Jose dos Campos station which was obtained from the available data since the riometer was set in operation at this site, on March 15, 1963. For each month, the values of the observations are tabulated for the first minute of each hour to the nearest 0.1 db, and the total number of readings for the month as well as the median and quartiles values are indicated in the same table. See for instance tables V through XVI. Note that figs. 2 and 3 also show the monthly medians mentioned above. Table I shows a listing of important flares which occured under sunlit periods for the station, whereas tables II and II contain all burst and SCNAs respectively under sunlight period as published by H.A.O. Boulder (Colorado). The absorption events measured at Sao Jose dos Campos are listed in table IV carryng time interval, maximum value of absorption, maximum variation about cosmic noise level, and eventual flare to which they are correlated. The figures 4 through 6 show three portions of riometer records registered at the Sao Jose dos Campos station during time intervals containing important solar flares and associated events. This station will continue its operation and provide data on ionospheric absorption as during the cooperative program for the International Quiet Sun Year (1964-1965). Data will be sent to the World Data Center, as established in the Guide to International Data Exchange, CIG-IQSY Committee. The recordings are reproduced in the AFCRL publication Geophysics and Space Data Bulletin 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1479 1: SID/SCD 2: 83 3: INPE-83-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Clemesha, Barclay Robert 18: A laser radar for atmospheric studies 20: 38 40: En 41: En 42: 58: DAE 59: MIROII 62: CNAE 64: Jan. <1969> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: AERONOMIA 83: The purpose of this report is to describe the MIRO II project, and in particular the instrumentation which is being constructed in CNAE for this project. The basic principles of the laser radar are explained, and the theory of atmospheric density measurements using such a radar is derived. The projected MIRO II radar is described, including its expected performance and a discussion of the requirements for atmospheric density measurements. The report finishes with a discussion of the possible further applications and developments of the project 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1480 1: SID/SCD 2: 84 3: INPE-84-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Mendonca, Fernando de 16: Kantor, Ivan Jalinex 16: Clemesha, Barclay Robert 18: Low latitude inospheric electron content measurements during half a solar cycle 20: 19 40: En 41: En 42: 58: DAE 59: RASA 62: CNAE 64: Jan. <1969> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: AERONOMIA 83: This paper presents the results of total electron content measurements made at Sao Jose dos Campos (23.22 S, 45.98 W)between 1963 and 1968. The 1963 measurements were made using the differential Doppler shift technique, and from December 1964 onwards the close spaced frequency method was employed, using the 40 e 41 Mhz transmission from the BE-B and BE-C satellites. An analysis is made of the variation of electron content with local time, dip angle, season, solar activity and magnetic activity. Special attention is given to the Equatorial Anomaly and the region of the Brazilian Magnetic Anomaly 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1481 1: SID/SCD 2: 85 3: INPE-85/LAFE 4: CEA 5: S 6: as 7: [07] 10: Mendonca, Fernando de 10: Sobral, Jose Humberto Andrade 10: Rai, D.B. 12: Equatorial atmosphere measurements obtained with the sounding rocket grenade experiment 14: 741-750 20: 21 30: Radio science 31: 4 32: 2 59: SAFO 61: 64: <1969> 66: Sao Jose dos Campos 67: BR 68: Pre 76: AERONOMIA 83: Under a Grenade series of experiments with sounding rockets, carried out att Barreira do Inferno, Natal (5.6 S, 35 W), nineteen successful launchings have yielded useful data on the upper stratosphere and the mesosphere during the period 7 August 1966 to 5 March 1968. These experiments covered the height range of about 35-95 km and were supplemented by 19 balloons radiosonde which provided data up to approximately 35 km. Also data from 29 meteorological rockets, with an upper limit of 60 km, are available for the period 14 September 1966 to 24 July 1968. Only two of these 29 launchings were instrumented for temperature measurements. Winds, temperatures and densities have been obtained and analysed from the rocket-grenade and balloon experiments. Some features of the wind and temperature distributions in the upper stratosphere and mesosphere are discussed. Extremely low mesopause temperatures of the order of 130 K were noticed in early summer at about 90 Km. The temperature at this height was found to be higher in winter than in summer. A correlation between temperature at 40 Km and absorption of cosmic noise at 30 MHz is also presented as a probable evidence of a stratosphere-ionosphere coupling 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1482 1: SID/SCD 2: 86 3: INPE-86/LAFE 4: CEA 5: MC 6: am 7: [07] 10: Nakamura,Y. 10: Clemesha, Barclay Robert 12: The interpretation of laser radar return from atmospheric aerosols 20: 24 40: EN 41: EN 42: 53: Confere on laser proberig of the atmosphere, 2 54: <1969. 56: Brookhaven 57: USA 58: DAE 59: MIRO 61: 62: CNAE 68: PRE 76: AERONOMIA 83: This paper presents the results of some computations of the scattering coefficients to be expected from various model aerosol distributions. The results are given in the form of an accumulative scattering coefficient displayed as a function of the upper limit of particle radius in the distribution. These curves are discussed from the point of view of the interpretation of laser radar returns from atmospheric aerosols, with reference to the derivation of figures for the particle concentration and the shape of the number density distribution 91: FDB-19940125 92: FDB-AYH 101: D MFN: 1483 1: SID/SCD 2: 89 3: INPE-89/LAFE 4: CEA 5: MP 6: m 7: [07] 16: Zamlutti, Carlos Jos‚ 18: Previsao de passagem para satelites em orbitas elipticas ou circulares sem pertubacoes 20: 51 40: Pt 41: Pt 42: 58: DAE 59: MESA 59: SONDA 62: CNAE 64: julho <1969> 66: Sao Jose dos Campos 67: BR 68: RPQ 76: AERONOMIA 83: O presente trabalho e um relatorio sobre o desenvolvimento de um programa, para o calculo da posicao de um satelite, feito para o projeto de sondagem vertical com satelites. O programa e razoavelmente simples e os resultados com ele obtidos mostram-se bastante satisfatorios para os propositos em pauta. Para o desenvolvimento de alguns topicos aqui abordados contou-se com a colaboracao da equipe do projeto MESA (Meteorologia com Satelites). A exposicao feita visa introduzir o leitor na solucao do problema de se conhecer a posicao de um satelite, num determinado instante e nos calculos envolvidos a seguir para o posicionamento de uma antena receptora destinada a captacao dos sinais enviados por esse satelite. A obra que serviu de base para as ideias aqui desenvolvidas foi "Estudo da Ionosfera Superior" publicada como Trabalho Individual em 1966 por Alfredo Carlos Graeff Anderson e Luiz Carlos Pinheiro da Silva 91: FDB-19940126 92: FDB-AYH 101: D 110: 1 111: Antonio D. Moura 112: CPT 113: 29.04.82 MFN: 1484 1: SID/SCD 2: 92 3: INPE-92 4: CEA 5: MP 6: m 16: Medrano Balboa, Rene Adalid 16: Mendonca, Fernando 18: Estimated electron precipitation at the center of the Brazilian Magnetic Anomaly 40: En 41: En 58: DAE 59: 88202X 62: INPE 64: <1969> 66: Sao Jose dos Campos 67: BR 68: LAF 76: AERONOMIA 91: 6908 MFN: 1486 1: SID/SCD 2: 95 3: INPE-95/LAFE 4: MET 5: MC 6: am 7: [07] 11: Instituto de Pesquisa Espaciais 12: Brazilian Participation in the EXAMETNET Program 14: 87 40: En 41: En 42: 53: Annual EXAMETNET Meeting, 4 54: 1-3 Oct. <1969> 56: Mar Del Plata 57: AR 58: DME 59: EXAME 61: 62: INPE 64: <1969> 68: PRE 90: b 76: METEOROLOGIA 83: The structure and state of the stratosphere and the mesosphere have been measured in Natal-BRAZIL under a program of meteorological measurements within the EXAMETNET program. One of the purposes of EXAMETNET is to contribute to studies of structure and behavior of the atmosphere and to help explain differences and similarities between the Northern and Southern Hemispheres. Data of density, temperature, pressure and wind velocities have been obtained by radiosonde from the ground to about 20 Km by Rocket from 18 Km to 100 Km at Natal since January 1966. They are believed to comprise the most comprehensive measurements of the Tropical Atmosphere. A brief description of the Atmospheric circulation, temperature and density structure at Natal is presented. Special emphasis is given to the period from January 1968 to March 1969. The appendix for this report includes a graph showing the launchings from Natal-Brazil, for the period from December 1967 to March 1969 and the Exametnet Meteorological Rocket Observations since the January 1966. Each plot presents the range of the available data in each launch 91: FDB-19932201 92: FDB-MD 101: D 110: 1 111: Antonio D. Moura 112: DME 120: D 113: 29-04-82 MFN: 1488 1: SID/SCD 2: 97 3: INPE-97/LAFE 4: CEA 5: T 6: m 7: [07] 16: Kantor, Ivan Jelinek 18: Wave polarization through the ionosphere and low latitude electron content 20: 126 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 58: DAE 59: RASA 62: CNAE 64: July <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 83: This thesis is concerned with the ionospheric electron content measured at Sao Jose dos Campos (23.22 S, 45.98 W)between 1963 and 1968. The main part of the data was reduced by means of differential Faraday method using the 40 and 41 MHz frequencies of BE-B and BE-C satellites. Here we study two distinct aspects of the same subject: the Faraday rotation and the electron content. In the second chapter we present an analysis of the polarization of waves travelling through the ionosphere. The introduction of the transverse component of the magnetic field, gives us a more general picture of the Faraday rotation, specially, near the quasi-transverse region. The analysis also provides a clue to the electron density profile determination. The third part is concerned with the measurements itselves. Variations of electron content with local time, dip angle, season and solar and magnetic activity are studied. Special attention is given to the behavior of the equatorial anomaly and the region of the Brazilian magnetic anomaly. A brief analysis of errors and reduction method is also presented 91: FDB-19940126 92: FDB-AYH 101: D 110: 1 110: 2 110: 1 110: 1 110: 1 111: Eurico Rodrigues de Paula 111: Ivan J. Kantor 111: Hulda O. de Carvalho 111: Hulda O. de Carvalho 111: Otto Grimolizzi 112: - 112: - 112: DBD 112: BCO DADOS 112: - 113: 18.12.78 113: 29.05.79 113: 15.09.81 113: 25.11.76 113: 03.03.77 MFN: 1489 1: SID/SCD 2: 98 3: INPE-98/LAFE 4: CEA 5: T 6: m 7: [07] 16: Nakamura, Yukitaka 18: Light scattering by atmospheric aerosols 20: 67 40: EN 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 59: MIRO 62: CNAE 64: July <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 83: This work presents the results of some computations of the scattering coefficients to be expected from various models of aerosol distribution and possibles indices of refraction. The results are given in the form of an accumulative scattering coefficient as a function of the upper limit of particle radius in the distribution. The necessary theory for scattering by aerosols is given. A brief description of the atmospheric aerosol is presented and in particular, the results of studies of stratospheric aerosols made by various techniques. A brief review of the laser radar technique is also presented. The particle concentration is estimated from a comparison between calculated scattering coefficients and those obtained from laser radar experiments. Assuming an index of refraction 1.42 and a size distribution with exponent equal to 3 for particles of radius up to 1 , the concentration found was about 1.5 x 10 particles per m . The scattering coefficients were calculated for various wavelenghts in order to investigate the possibility of determining the distribution by means of a multi-frequency experiment. It is concluded that only in the case of a distribution extending to particle radii well below 0.1 , and having the concentration proportional to the 4th power of the radius, would it be possible to distinguish the actual distribution from other possible ones 91: FDB-19940126 92: FDB-AYH 101: D 110: 1 110: 1 111: Hulda O. de Carvalho 111: Hulda O. de Carvalho 112: DBD 112: BCO DADOS 113: 15.09.81 113: 25.11.76 MFN: 1490 1: SID/SCD 2: 105 3: INPE-105-LAFE 4: CEA 5: T 6: m 7: [07] 16: Medrano-Balboa, Rene Adalid 18: Distribution of precipitating electron flux in the South Atlantic anomaly 20: 63 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 58: DAE 59: TELA 62: INPE 64: July <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 76: AERONOMIA 83: Calculated fluxes of precipitating electrons from the Van Allen radiation belts in the region of the South Atlantic Anomaly are presented. Particles mirroring at or below 100 Km height are assumed to be absorved by the atmosphere. Computations along several L lines have been performed. A line of maximum precipitation is found, eastward from which there should be a considerable decrease in the flux of precipitating electrons. Two maxima of precipitation occur along this line one of which is more important than the other. Results of the computations suggest a gradual replenishment of trapped electrons for L < 2.2 and a sharp replenishment of trapped electrons for L > 3 91: FDB-19940127 92: FDB-MLR 101: D MFN: 1491 1: SID/SCD 2: 107 3: INPE-107-LAFE 4: CEA 5: T 6: m 7: [07] 16: Souza, Jose Ricardo S. de 18: Determination of exospheric plasma densities using long-period geomagnetic micropulsation parameters at low latitudes 20: 79 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 58: CEA 59: MATE 62: INPE 64: Dec. <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 83: Considering long-period geomagnetic continuous pulsations as resulting from standing waves along the geomagnetic lines of force, we have used the parameters period and amplitude of 411 Pc events at the low latitude observation station of Sao Jose dos Campos - Brazil, in order to perform plasma densities calculations in the exosphere. A simplified model for the upper ionosphere and exospheric composition and behavior was adopted. Statistical analysis of Pc4 and Pc5 occurrences, periods and amplitudes, was made for the six years data available with a view to prediction of these parameters. The calculated densities have showed reasonable agreement with those obtained by other researchers 91: FDB-19940127 92: FDB-MLR 101: D MFN: 1492 91: FDB-19940127 92: FDB-MLR 101: D 110: 1 111: Antonio D. Moura 112: CPT 120: D 113: 29.04.82 58: SPG 58: MET 59: LUME 62: INPE 64: Dec. <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 76: METEOROLOGIA POR SATELITE 83: The first part of this thesis presents a general study of the present state of our knowledge of airglow. The recent literature in the field is surveyed and the various line and continuum emissions from the ultraviolet to the infra-red are described and discussed in terms of their identification, intensities and probable causative agencies. The second part of the thesis deals specifically with the 6300A line of atomic oxygen, originating in the F-region of the ionosphere. The recombination processes leading to the production of this line are discussed, and the derivation of Barbier`s semi-empirical formula for the line intensity is given. Experimental data from Huancayo. Peru, taken during the I.G.Y. are analysed from the point of view of their correlation with the F-region parameters h`Fand F2. A small negative correlation is found between the 6300A intensity and h`F. Comparison between the experimental nocturnal variation of the intensity and that predicted by Barbier`s formula shows that the latter gives a good explanation of the nocturnal variation at a station of low magnetic latitude 18: A study of atmospheric nightglow 20: 103 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 1: SID/SCD 2: 110 3: INPE-110-LAFE 4: MET 5: T 6: m 7: [07] 16: Elias, Marlene MFN: 1494 91: FDB-19940127 92: FDB-MLR 100: MLR 101: D 58: CEA 59: RASA 62: INPE 64: Dec. <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 83: The regular Faraday fading on the unmodulated 40 MHz signal from the radio beacon satellite Explorer B (BE-B)sometimes presents a randon fading superposed on it, named scintillations. The study of these fluctuations in signal strength provides a useful method of investigating the irregular distribution of ionospheric electron density. Such research has been carried out with the recorded signal at the receiving station at Sao Jose dos Campos (lat. 23 ,2S; long. 45 ,9W)during the half solar cycle (1964-1968). A review of the formation of ionospheric layers is presented, and irregularities in the F-region and their relation with scintillation are discussed. The results of our study show a nighttime maximum occurrence and a very weak percentage of occurrence during daytime. They also show a maximum occurrence at low-latitude regions in summer, a positive correlation between magnetic activity and strong scintillation occurrence during winter, while an oppositive effect is seen in summer, a positive correlation with solar activity for points near the equator, and a negative correlation for points at mid-latitudes 18: Scintillation studies as a method of the detection of ionospheric irregularies 20: 105 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 1: SID/SCD 2: 112 3: INPE-112-LAFE 4: CEA 5: T 6: m 7: [07] 16: Silva, Pedro Paulo Nunes Tavares da MFN: 1495 91: 6907 58: CEA 59: CEA 62: CNAE 64: jul. <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 83: Physical effects of a magneto-ionic medium on a radio-wave transversing the ionosphere have been used to determine ionospheric electron content near the magnetic equator. More than 200 passes of BE-B satellite have been recorded in the Space Science Laboratory of CNAE during the year of 1966. Amongst these only 103 recordings were reduced and processed by the differential Doppler Method. Some of these passes have also been analyzed by the hybrid method. Graphs are presented showing variation of electron content with time, geographical latitude and magnetic dip, obtained by three methods namely: differential Doppler, Faraday rotation angle and hybrid method. The basic theory necessary for understanding the above dited methods as well as the description of the equipment used to record the satellite signals are presented 1: SID/SCD 2: 113 3: INPE-113-LAFE 4: CEA 5: T 6: m 7: [07] 16: Abreu Neto, Amaro Lopes 18: Electron content measurements at a low latitude station 20: 64 40: En 41: En 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre MFN: 1496 1: SID/SCD 2: 115 3: INPE-115-LAFE 4: CEA 5: MP 6: m 7: [07] 16: Silva 18: DISTRIBUTION OF INNER ZONE PHOTONS, WITH ENERGY 3,5MEV IN THE BRAZILIAN MAGNETIC ANOMALY 20: 000 59: 88202X 61: NE 64: <1969> 68: LAF 91: 6908 MFN: 1497 1: SID/SCD 2: 117 3: INPE-117-LAFE 4: CEA 5: T 6: m 7: [07] 16: Zamlutti, Carlos Jose 18: Sondagem superior em Sao Jose dos Campos 20: 90 40: PT 41: Pt 42: 50: Comissao Nacional de Atividades Espaciais 51: Mestre 58: DAE 59: CEA 62: INPE 64: jul. <1969> 66: Sao Jose dos Campos 67: BR 68: TDI 90: b 76: AERONOMIA 83: Este trabalho foi desenvolvido baseado na adaptacao de uma estacao APT a recepcao de sinais do satelite sondador Alouette-B. O desenvolvimento adotado visa colocar o leitor a par do metodo de sondagem superior, do problema da recepcao de sinais em Sao Jose dos Campos, do conveniente exame dos ionogramas obtidos para deles extrair os dados desejados e finalmente dos primeiros resultados que se podem obter desses dados. A analise dos dados permitiu concluir da grande utilidade da sondagem superior, bem como da diversidade de resultados que dela podem ser obtidos. Como o leitor podera observar este trabalho e um trabalho estrutural ao programa de estudos da parte superior da ionosfera, por meio de ionogramas obtidos em satelites, a que se propoe a parte de sondagem superior do projeto SONDA da Comissao Nacional de Atividades Espaciais 91: FDB-19940128 92: FDB-MLR 101: D MFN: 1498 1: SID/SCD 2: 120 3: INPE-120 4: CEA 5: MP 6: m 16: Sobral, Jose Humberto Andrade 18: A study of the meteorological parameters in the stratosphere and mesosphere 40: En 41: En 42: 58: DAE 59: 88202X 62: INPE 64: <1969> 66: Sao Jose dos Campos 68: LAF 76: AERONOMIA 91: 6910 MFN: 2119 1: SID/SCD 2: 1960 3: INPE-1960-RPE/274 4: MET 5: MP 6: m 7: [07]551.507.362.2:621.397.23 16: Garrido, Juan Carlos Pinto de 16: Carvalho, Luiz Geraldo Rocha de 18: Sistema de trasmissao de imagens de satelites meteorologicos por via telefonica 20: 23 40: Pt 41: Pt 41: En 42: 58: DME 62: INPE 64: dez. <1980> 66: Sao Jose dos Campos 67: BR 68: RPE 90: b 76: METEOROLOGIA 91: FDB-19930209 92: FDB-MD 101: D MFN: 3063 1: SID/SCD 2: 7366 3: INPE-7366-PRE/3256 4: CEA 5: S 6: as 7: [07] 10: Heirtzler, J.R. 10: Mendonca, Fernando de 10: Montes, H 12: Rapid geomagnetic activity at very low latitude conjugate stations 14: 502-507 30: Annales Geophysicae 31: 22 32: 3 40: En 41: En 42: 58: DAE 59: IONO 61: 64: jul-sep. <1966> 68: PRE 76: AERONOMIA 87: CAMADA-F 87: CAMPO MAGNETICO 87: medi‡Ćo 83: Geomagnetic total field intensity measurements were made at opposite ends of a line of force that passes through the F-layer. The activity was similar in great detail especially for periods greater than 40 seconds. Therewas abundant small scale micropulsation activity at all periods but 50 to 70 second period activity was most frequently observed and that type event occurred most frequently at local noon 91: FDB-20000125 92: FDB-MLR MFN: 3064 1: SID/SCD 2: 7486 3: INPE-7486-PRE/3373 4: CEA 5: S 6: as 7: [07] 10: Ross, W.J. 10: Garriott, O.K. 10: Mendonca, Fernando 10: Rosa, Aldo Vieira 12: Comments on local electron concentration determination from doppler dispersion measurements of satellite radio beacons 14: 1102-1106 30: Journal of Geophysical Research 31: 73 32: A3 40: En 41: En 42: 58: DGE 59: IONO 61: 64: <1968> 68: PRE 76: AERONOMIA 87: IONOSFERA 83: During the past several years the use of satellite radio beacons in the study of the ionosphere has become well established. In particular, the measurement of dispersion in the optical path length between a satellite source and a receiver on the ground (ionospheric Doppler shift)has been used exten-sively and successfully to determine the integrated electron content of the ionosphere over the propagation path, and to follow its variation as the satellite moves in the field of view of the receiver 91: FDB-20000128 92: FDB-MLR MFN: 3082 1: SID/SCD 2: 8829 3: INPE-8829-PRE/4548 4: CEA 5: S 6: as 10: Trivedi, Nalin Babulal 10: Rastogi, G. 12: Studies of sudden changes in H and Z equatorial stations in Indian zone 14: 1037 30: Annales Geophysique 31: 24 32: 4 40: En 41: En 42: 58: DAE 59: GEOMA 61: 64: <1968> 68: PRE 76: AERONOMIA 83: The storm time commencements (SC)and sudden impulses (SI)in H and Z at equatorial stations in the Indian zone during IGYIIGC are discussed. The amplitude of both SC and SI in H at the equatorial stations are enhanced during the midday hour. At any particular hour during the daytime the amplitudes are enhanced over a narrow zone over the magnetic equator. There is no distinct latitudinal enhancement of SC or SI during nighttime but the amplitudes are significantly higher at Annamalainagar. The latitudinal variation of the amplitude of SC in Z in Indian zone do not conform to the simp1q.thin sheet model of the electrojet and the interpretation should be sought in the abnormal induced currents MFN: 3083 1: SID/SCD 2: 8828 3: INPE-8828-PRE/4547 4: CEA 5: S 6: as 10: Rastogi, R.G. 10: Trivedi, Nalin Babulal 12: Night-time sudden commencements in H within equatorial electrojet region 14: 131-136 30: Journal of Atmospheric and Terrestrial Physics 31: 28 32: 1 58: DAE 59: GEOMA 61: 64: <1966> 68: PRE 76: AERONOMIA 83: It is shown that during the night the change of H accompanying a SC is greater at small magnetic dips than at large magnetic dips in the American zone-but that this difference is not so clearly marked in the Indian zone 91: 7307 MFN: 3105 1: SID/SCD 2: 8831 3: INPE-8831-PRE/4550 4: CEA 5: S 6: as 10: Rastogi, R.G. 10: Trivedi, Nalin Babulal 12: Studies of sudden changes in H at equatorial stations in American zone 14: 771 30: Annales Geophyique 31: 24 32: 3 58: DGE 59: IONO 61: 64: <1968> 68: PRE 76: AERONOMIA 83: The storm sudden commencements (SC)and sudden impulses (SI)in H at equatorial stations in American Zone during IGY1IGC are discussed. The occurrence of SI is most frequent around midday whereas distribution of SC frequency with local time is uncertain. The amplitude of both SC and Slat the equatorial stations are enhanced during daylight hours. At any particular hour the amplitudes are enhanced only over a narrow zone over the magnetic equator. The enhancement is identical for SC an4 SI. It is suggested that the mechanism for equatorial enhancement for SC and SI is same 91: 7607 MFN: 9437 1: SID/SCD 2: 8318 3: INPE-8318-PRE/4101 4: CEA 5: S 6: as 7: [07] 10: Abdu, Mangalathyil Ali 10: Degaonkar, S.S. 10: Ramanathan, K.R. 12: Attenuation of galatic noise at 25 Mhz and 21.3 Mhz in the ionosphere over Ahmedabad during 1957-1964 14: 1547-1554 30: Journal of Geophysical Research 31: 72 32: 5 40: En 41: En 42: 59: DAE 61: 64: Mar. <1967> 68: PRE 90: b 76: AERONOMIA 87: ruˇdo eletromagn‚tico 87: ondas radio gal ticas 87: regiĆo F 87: espalhamento de el‚trons 87: ruˇdo ionosf‚rico 87: atividade solar 88: solar activity 88: electromagnetic noise 88: galatic radio waves 88: F region 88: electron scattering 88: ionospheric noise 83: Measurement of the intensity of galactic radio noise at Ahmedabad from 1957 to 1964 has, shown that its attenuation has decreased steadily with the decline of solar activity. Calculation of the absorption in the D region and in the F region up to the F2 peak using N(h)profiles and effective collision frequencies of electrons has shown that a large part of the absorption of galactic radio noise takes place in the F region over Ahmedabad, both below and above the F peak. It is also found that the nighttime attenuation in low solar activity period (1964-1965)is much larger than can be explained on the basis of electron-ion collision processes alone. It is suggested that scattering of galactic radio noise by inhomogeneities in the F region is a source of extra attenuation during night in a low solar activity period, since it is known that the occurrence of spread F shows a considerable increase during night at Ahmedabad in low sunspot years. The absorption measurements also suggest that electron temperatures are appreciably higher than neutral gas temperatures in the early morning hours and that the excess temperature of electrons is higher in low sunspot years than in high sunspot years 91: FDB-20011107 92: FDB-MLR MFN: 9438 1: SID/SCD 2: 8347 3: INPE-8347-PRE/4130 4: CEA 5: S 6: as 7: [07] 10: Abdu, Mangalathyil Ali 10: Degaonkar, S.S. 12: Deduction of electron temperature from F-region component of absorption of cosmic radio noise 14: 5559-5562 30: Journal of Geophysical Research 31: 72 32: 21 40: En 41: En 42: 59: DAE 61: 64: Nov. <1967> 68: PRE 90: b 76: AERONOMIA 87: RegiĆo F2 87: energia de eletrons 87: absor‡Ćo 87: ruˇdo c˘smico 87: ioniza‡Ćo 88: F2 region 88: electron energy5absorption 88: cosmic noise 88: ionization 83: In a recent paper by Abdu et al. [1967], the total cosmic radio absorption at Ahmedabad was divided into two components (1)a component that depends on f0F2, and (2)a com- ponent that arises mainly in, the D region of the ionosphere. In the present note we describe the results of deduction of electron temperatures from the component of F-region absorption of cosmic radio noise recorded at Ahmedabad at -25 Mhz during 1957-1958 and at 21.3 Mhz during 1964-1965 91: FDB-20011107 92: FDB-MLR MFN: 9559 1: SID/SCD 2: 8546 3: INPE-8546-PRE/4290 4: CEA 5: S 6: as 7: [07] 10: Degaonkar, S.S. 10: Abdu, Mangalathyil Ali 12: The effect of antenna aperture on the reception of cosmic radio noise at the ground 14: 290-295 30: Journal Institution of Telecommunication Engineers (India) 31: 13 32: 7 40: En 41: En 42: 58: DAE 61: 64: <1967> 68: PRE 76: AERONOMIA 87: sntenas 87: som c˘smico 87: recep‡Ćo de r dio 87: regiĆo F 88: antennas 88: cosmic noise 88: radio reception 88: F region 83: The effect of antenna aperture on the reception of cosmic radio noise is considered and it is shown that with the arrangement used at Ahmedabad, the ionospheric aperture and wedge refraction due to horizontal gradients of ionization do not introduce any significant attenuation MFN: 9630 1: SID/SCD 2: 8663 3: INPE-8663-PRE/4399 4: CEA 5: S 6: as 7: [07] 10: Degaonkar, S.S. 10: Abdu, Mangalathyil Ali 12: Electron temperatures in the ionospheric F-region over Ahmedabad 14: 555-562 30: Journal Atmospheric and Terrestrial Physics 31: 30 32: 4 40: En 41: En 42: 58: DAE 59: Projeto IONO 61: 64: <1968> 68: PRE 76: AERONOMIA 87: medidas locais 87: energia eletr“nica 87: temperatura ionosf‚rica 87: regiĆo F 88: in situ measurement 88: electron energy 88: ionospheric temperature 88: regiĆo F 83: The electron temperature in the F-region has been deduced from the derived F-region component of absorption of cosmic radio noise at 25 MHz in high sunspot year (1957-1958)and 21-3 MHz in low sunspot year (1964-65). It is shown that the diurnal and seasonal variation of electron temperature obtained from the present analysis are in good agreement with in situ measurement of electron temperature by satellites 91: FDB-20000305 92: FDB-MLR