@InProceedings{CandidoBKNBPSC:2018:ReToEl,
author = "Candido, Cl{\'a}udia Maria Nicoli and Batista, Inez Staciarini
and Klausner, Virginia and Negreti, Patr{\'{\i}}cia Mara de
Siqueira and Becker Guedes, F{\'a}bio and Paula, Eurico Rodrigues
de and Shi, Jiankui and Correia, E. S.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale
do Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Presbiteriana Mackenzie}",
title = "Response of the total electron content at Brazilian low latitudes
to corotating interaction region and high-speed streams during
solar minimum 2008",
year = "2018",
organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e
Aeronomia, 7. (SBGEA)",
abstract = "In this work, we investigate the Brazilian low latitude
ionospheric response to two Corotating Interaction Region (CIRs)
and High-Speed Streams (HSSs) events during the solar minimum of
solar cycle 23, in 2008. The studied intervals are enclosed in the
Whole Heliospheric Interval (WHI), studied by other authors, for
distinct longitudinal sectors. CIRs/HSSs are structures commonly
observed during the descending and low solar activity, and they
are related to the occurrence of coronal holes. These events cause
weak to moderate recurrent geomagnetic storms characterized by
negative excursions of the interplanetary magnetic field, IMF_Bz,
as well as long duration auroral activity, considered as a
favorable scenario for continuous Prompt Penetration
Interplanetary Electric Field (PPEF). In this study, we used the
Vertical Total Electron Content (VTEC) calculated from GPS
receivers database from the Brazilian Continuous Monitoring
Network (RBMC) managed by the Brazilian Institute of Geography and
Statistics (IBGE). Moreover, we analyzed the F-layer peak height,
hmF2 and the critical plasma frequency, foF2, taken from a
Digisonde installed at the southern crest of the Equatorial
Ionization Anomaly (EIA), in Cachoeira Paulista, CP. It was
observed that during the CIRs/HSSs-driven geomagnetic disturbances
VTEC increased more than 120% over the quiet times averaged
values, which is comparable to intense geomagnetic storms. On the
other hand, VTEC decreases were also observed during the recovery
phase of the storm. Spectral analysis using Gapped Wavelet
Technique (GWT) revealed periodicities of 7, 9, 13.5 days, which
are subharmonics of the solar rotation period, ~ 27 days. These
periods in VTEC are closely associated with those observed in
solar and geomagnetic indices such as Vsw, IMF_Bz, and AE during
CIRs/HSSs intervals. We discuss PPEF associated to IMF_Bz
reconnection processes and the auroral activity as the most
probable causes for the VTEC variations. These results can be of
interest for studies related to Space Weather monitoring, modeling
and forecasting, especially during low solar activity.",
conference-location = "Santa Maria, RS",
conference-year = "05-09 nov",
language = "pt",
urlaccessdate = "02 maio 2024"
}