@Article{Becker-GuedesSFEPLBBOSMPB:2007:IoReBr,
author = "Becker-Guedes, E. and Sahai, Y. and Fagundes, P. R. and Espinoza,
E. S. and Pillat, V. G. and Lima, W. L. C. and Basu, Su and Basu,
Sa and Otsuka, Y. and Shiokawa, K. and Mackenzie, E. M. and Pi, X
and Bittencourt, Jos{\'e} Augusto",
affiliation = "{Universidade do Vale do Paraiba (UNIVAP)} and Radio Observatorio
de Jicamarca, Instituto Geofisico del Peru and {Universidade do
Vale do Paraiba (UNIVAP)} and Radio Observatorio de Jicamarca,
Instituto Geofisico del Peru and {Universidade do Vale do Paraiba
(UNIVAP)} and Centro Univ. Luterano de Palmas (CEULP),
Universidade Luterana do Brasil (ULBRA) and Center for Space
Physics, Boston University and Space Vehicles Directorate, Air
Force Research Laboratory and STELAB, Nagoya University and
STELAB, Nagoya University and Institute for Scientific Research,
Boston College and Jet Propulsion Laboratory, California Institute
of Technology and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "The ionospheric response in the Brazilian sector during the super
geomagnetic storm on 20 November 2003",
journal = "Annales Geophysicae",
year = "2007",
volume = "25",
number = "4",
pages = "863--873",
keywords = "Ionosphere (Equatorial ionosphere, Ionospheremagnetosphere
interactions, Ionospheric irregularities).",
abstract = "A very intense geomagnetic storm (superstorm) began with storm
sudden commencement (SSC) at 08:03 UT on 20 November 2003, as a
result of the coronal mass ejection (CME) by sunspot 484 hurled
into space on 18 November 2003. The geomagnetic storm attained
|Dst |max=472 nT at 20:00 UT (20 November). In this paper we
present the simultaneous ionospheric sounding observations, using
the Canadian Advanced Digital Ionosondes (CADIs), carried out from
Palmas (PAL; 10.2 S, 48.2W; dip latitude 5.5 S; a near equatorial
station) and Sao Jos´e dos Campos (SJC; 23.2 S, 45.9W; dip
latitude 17.6 S; station located under the crest of equatorial
ionospheric anomaly), Brazil. In addition, total electron content
(TEC) measurements from several GPS receiving stations in the
Brazilian sector during this storm are presented. The simultaneous
ionospheric sounding observations carried out at SJC and PAL, and
TEC observations on 3 consecutive days viz., 19 November (quiet),
20 November (disturbed) and 21 November (recovery phase) are
presented. Salient features from the ionospheric observations in
the Brazilian sector during the superstorm are discussed. The
difference in the observed ionospheric response at the two
stations (PAL and SJC) is considerable. This is not surprising
given that PAL is close to the magnetic equator and SJC is near
the crest of the equatorial ionospheric anomaly (EIA). It should
be pointed out that soon after the SSC (about 4 h later), the
F-region critical frequency (foF2), the F-region peak height
(hpF2), and variations of virtual heights at different frequencies
(iso-frequency plots) all show wavelike oscillations of the
F-region during daytime at both the ionospheric sounding stations.
Unusual rapid uplifting of F-region at PAL was observed during
both the main and recovery phases of the storm.",
copyholder = "SID/SCD",
issn = "0992-7689",
language = "en",
targetfile = "the ionospheric.pdf",
urlaccessdate = "15 jun. 2024"
}