@Article{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, Em{\'{\i}}lia",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Response of the total electron content at Brazilian low latitudes
to corotating interaction region and high-speed streams during
solar minimum 2008",
journal = "Earth, Planets and Space",
year = "2018",
volume = "70",
pages = "e104",
month = "June",
keywords = "Solar minimum, High-speed streams, Corotating interaction region,
High-intensity long-duration continuous auroral activity,
Equatorial ionization anomaly, Total electron content.",
abstract = "In this work, we investigate the Brazilian low-latitude
ionospheric response to two corotating interaction regions (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, 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 managed by the Brazilian Institute of Geography and
Statistics. 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, 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 sub-harmonics
of the solar rotation period, similar to 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.",
doi = "10.1186/s40623-018-0875-8",
url = "http://dx.doi.org/10.1186/s40623-018-0875-8",
issn = "1880-5981",
language = "en",
targetfile = "candido_response.pdf",
urlaccessdate = "28 abr. 2024"
}