@Article{AbreuSaFaBeJeGuPi:2010:ReIoFr,
author = "Abreu, Alessandro Jos{\'e} de and Sahai, Y. and Fagundes, P. R.
and Becker-Guedes, F. and Jesus, R. de and Guarnieri, F. L. and
Pillat, V. G.",
affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale
do Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade do Vale do Para{\'{\i}}ba
(UNIVAP)} and {Vale Solu{\c{c}}{\~o}es em Energia (VSE)} and
{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)}",
title = "Response of the ionospheric F-region in the Brazilian sector
during the super geomagnetic storm in April 2000 observed by GPS",
journal = "Advances in Space Research",
year = "2010",
volume = "45",
number = "11",
pages = "1322--1329",
month = "June",
keywords = "Storms - Atmospheric electricity - Electric fields - Geomagnetism
- Global positioning system - Ionosphere - Ionospheric measurement
- Magnetosphere - Satellites.",
abstract = "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), Bras{\'{\i}}lia (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.",
doi = "10.1016/j.asr.2010.02.003",
url = "http://dx.doi.org/10.1016/j.asr.2010.02.003",
issn = "0273-1177",
label = "self-archiving-INPE-MCTIC-GOV-BR",
language = "en",
targetfile = "response of the ionospheric.pdf",
urlaccessdate = "15 jun. 2024"
}