%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3EU29DP
%3 1-s2.0-002191699400068Y-main.pdf
%X Very low frequency signals (VLF) received in Atibaia (Brazil) during the occurrence of the two major solar-proton events of August 1972 and July 1974 were analysed. Phase and amplitude changes observed at night were introduced in the model given by Wait and Spies (1964) properly adapted to the ionospheric conditions of the South Atlantic Geomagnetic Anomaly (SAGA) region. Electron density disturbed profiles for ""L"" shell intervals 1. 15 < L < 2.0 and 1.08 < L < 1. 15 were deduced. The results highlight the great amount of ionization produced at low ""L"" values due to the precipitation of energetic particles in the SAGA, mainly at night. Some discrepancies among the electron density profiles proposed by different authors are discussed.
%8 July
%N 8
%@secondarydate 19960404
%T Night-time D-region electron density variations observed in the South Atlantic Geomagnetic Anomaly in association with solar-proton events
%@electronicmailaddress aracy@dge.inpe.br
%K very low frequency signals (VLF), D-region, electron density, South Atlantic Geomagnetic Anomaly (SAGA).
%@secondarytype PRE PI
%@archivingpolicy denypublisher denyfinaldraft24
%@usergroup administrator
%@usergroup banon
%@usergroup jefferson
%@group DGE-INPE-MCT-BR
%@secondarykey INPE-5907-PRE/2049
%F 7280
%@issn 1364-6826
%2 sid.inpe.br/iris@1905/2005/07.29.03.07.16
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Centro de Rádio Astronomia e Aplicações Espaciais, CRAAE, Escola Politécnica da Universidade de São Paulo
%B Journal of Atmospheric and Solar-Terrestrial Physics
%@versiontype publisher
%P 899-904
%4 sid.inpe.br/iris@1905/2005/07.29.03.07
%@documentstage not transferred
%D 1995
%V 57
%A Mendes da Costa, Aracy,
%A Rizzo Piazza, Liliana,
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX.
%@area CEA