%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%@archivingpolicy denypublisher denyfinaldraft24
%X The response of the ionospheric F-region in the equatorial and low latitude regions in the Brazilian sector during the super geomagnetic storm on 0607 April 2000 has been studied in the present investigation. The geomagnetic storm reached a minimum Dst of −288 nT at 0100 UT on 07 April. In this paper, we present vertical total electron content (VTEC) and phase fluctuations (in TECU/min) from GPS observations obtained at Imperatriz (5.5°S, 47.5°W; IMPZ), Brasília (15.9°S, 47.9°W; BRAZ), Presidente Prudente (22.12°S, 51.4°W; UEPP), and Porto Alegre (30.1°S, 51.1°W; POAL) during the period 0508 April. Also, several GPS-based TEC maps are presented from the global GPS network, showing widespread and drastic TEC changes during the different phases of the geomagnetic storm. In addition, ion density measurements on-board the satellite Defense Meteorological Satellite Program (DMSP) F15 orbiting at an altitude of 840 km and the first Republic of China satellite (ROCSAT-1) orbiting at an altitude of 600 km are presented. The observations indicate that one of the orbits of the DMSP satellite is fairly close to the 4 GPS stations and both the DMSP F15 ion-density plots and the phase fluctuations from GPS observations show no ionospheric irregularities in the Brazilian sector before 2358 UT on the night of 0607 April 2000. During the fast decrease of Dst on 06 April, there is a prompt penetration of electric field of magnetospheric origin resulting in decrease of VTEC at IMPZ, an equatorial station and large increase in VTEC at POAL, a low latitude station. This resulted in strong phase fluctuations on the night of 0607 April, up to POAL. During the daytime on 07 April during the recovery phase, the VTEC observations show positive ionospheric storm at all the GPS stations, from IMPZ to POAL, and the effect increasing from IMPZ to POAL. This is possibly linked to the equatorward directed meridional wind. During the daytime on 08 April (the recovery phase continues), the VTEC observations show very small negative ionospheric storm at IMPZ but the positive ionospheric storm effect is observed from BRAZ to POAL possibly linked to enhancement of the equatorial ionospheric anomaly.
%@mirrorrepository sid.inpe.br/mtc-m19@80/2009/08.21.17.02.53
%8 June
%N 11
%T Response of the ionospheric F-region in the Brazilian sector during the super geomagnetic storm in April 2000 observed by GPS
%@secondarytype PRE PI
%K Storms - Atmospheric electricity  -  Electric fields  -  Geomagnetism  -  Global positioning system  -  Ionosphere  -  Ionospheric measurement  -  Magnetosphere  -  Satellites.
%@usergroup administrator
%@usergroup banon
%@usergroup marciana
%@usergroup simone
%@group DAE-CEA-INPE-MCT-BR
%@group DAE-CEA-INPE-MCT-BR
%3 response of the ionospheric.pdf
%@secondarykey INPE--PRE/
%@secondarymark B4_ASTRONOMIA_/_FÍSICA B3_CIÊNCIAS_BIOLÓGICAS_I B1_ENGENHARIAS_III B1_ENGENHARIAS_IV B1_GEOCIÊNCIAS B1_INTERDISCIPLINAR
%@issn 0273-1177
%2 sid.inpe.br/mtc-m19@80/2010/06.01.13.28.01
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%@affiliation Vale Soluções em Energia (VSE)
%@affiliation Universidade do Vale do Paraíba (UNIVAP)
%B Advances in Space Research
%P 1322-1329
%4 sid.inpe.br/mtc-m19@80/2010/06.01.13.27
%@documentstage not transferred
%D 2010
%V 45
%@doi 10.1016/j.asr.2010.02.003
%A Abreu, A. J.,
%A Sahai, Y.,
%A Fagundes, P. R.,
%A Becker-Guedes, F.,
%A Jesus, R. de,
%A Guarnieri, F. L.,
%A Pillat, V. G.,
%@dissemination WEBSCI; PORTALCAPES; MGA; COMPENDEX.
%@area CEA