%0 Journal Article %@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S} %@nexthigherunit 8JMKD3MGPCW/3ETL868 %@archivingpolicy denypublisher denyfinaldraft24 %3 1-s2.0-0021916986900838-main.pdf %X F-layer height and ionization vertical drift evening enhancements over Fortaleza, a magnetic equatorial location in Brazil, are investigated under different circumstances of range-type spread-F occurrence over that station, together with those over the low latitude location, Cachoeira Paulista. Over the latter location the spread-F seems to occur only in association with vertically extended flux tube-aligned plasma bubble development over the equator. The present study shows that the threshold conditions at the F-layer height and ionization vertical drift for plasma bubble generation and growth over the equator are different from those required for the production of equatorial bottomside spread-F only. Conditions of the F-layer dynamo-induced eastward electric field evening enhancements for these cases are briefly discussed. %8 Feb. %N 2 %T Equatorial F-region irregularity latitudinal extension and dynamo electric field %@electronicmailaddress %@electronicmailaddress %@electronicmailaddress inez@dae.inpe.br %K F-layer, spread-F, plasma bubble, ionization, magnetic equatorial location. %@secondarytype PRE PI %@usergroup administrator %@usergroup banon %@usergroup jefferson %@group DAE-INPE-BR %@group %@group DAE-INPE-BR %@secondarykey INPE-3494-PRE %F 2566 %@issn 1364-6826 %2 sid.inpe.br/iris@1905/2005/07.26.21.15.30 %@affiliation Instituto Nacional de Pesquisas Espaciais (INPE) %@affiliation Instituto Nacional de Pesquisas Espaciais (INPE) %@affiliation Instituto Nacional de Pesquisas Espaciais (INPE) %@project FNDCT (FINEP 537/CT). %B Journal of Atmospheric and Solar-Terrestrial Physics %@versiontype publisher %P 181-186 %4 sid.inpe.br/iris@1905/2005/07.26.21.15.28 %@documentstage not transferred %D 1986 %V 48 %A Nelson, O. R., %A Abdu, Mangalathayil Ali, %A Batista, Inez Staciarini, %@dissemination WEBSCI; PORTALCAPES; COMPENDEX. %@area CEA