@Article{MoroXDRBSSCPCLYWS:2021:ReReCo,
author = "Moro, Juliano and Xu, J. and Denardini, Clezio Marcos and Resende,
Laysa Cristina Ara{\'u}jo and Barbosa Neto, Paulo Fran{\c{c}}a
and Silva, Ligia Alves da and Silva, R{\'e}gia Pereira da and
Chen, Sony Su and Pican{\c{c}}o, Giorgio Arlan da Silva and
Carmo, Carolina de Sousa do and Liu, Zehngkuan and Yan, Chunxiao
and Wang, Chi and Schuch, Nelson Jorge",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {State Key
Laboratory of Space Weathe} 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)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {State Key Laboratory of Space Weather} and {State Key
Laboratory of Space Weather} and {State Key Laboratory of Space
Weathe} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "First Look at a Geomagnetic Storm With Santa Maria Digisonde Data:
F Region Responses and Comparisons Over the American Sector",
journal = "Journal of Geophysical Research: Space Physics",
year = "2021",
volume = "126",
number = "1",
pages = "e2020JA028663",
month = "Jan.",
abstract = "Santa Maria Digisonde data are used for the first time to
investigate the F region behavior during a geomagnetic storm. The
August 25, 2018 storm is considered complex due to the incidence
of two Interplanetary Coronal Mass Ejections and a High-Speed
Solar Wind Stream (HSS). The F 2 layer critical frequency (f o F
2) and its peak height (h m F 2) collected over Santa Maria, near
the center of the South American Magnetic Anomaly (SAMA), are
compared with data collected from Digisondes installed in the
Northern (NH) and Southern (SH) Hemispheres in the American
sector. The deviation of f o F 2 (Df o F 2) and h m F 2 (Dh m F 2)
are used to quantify the ionospheric storm effects. Different F
region responses were observed during the main phase (August
2526), which is attributed to the traveling ionospheric
disturbances and disturbed eastward electric field during
nighttime. The F region responses became highly asymmetric between
the NH and SH at the early recovery phase (RP, August 26) due to a
combination of physical mechanisms. The observed asymmetries are
interpreted as caused by modifications in the thermospheric
composition and a rapid electrodynamic mechanism. The persistent
enhanced thermospheric [O]/[N2] ratio observed from August 27 to
29 combined with the increased solar wind speed induced by the HSS
and IMF B z fluctuations seem to be effective in causing the
positive ionospheric storm effects and the shift of the Equatorial
Ionization Anomaly crest to higher than typical latitudes.
Consequently, the most dramatic positive ionospheric storm during
the RP occurred over Santa Maria (\∼120%).",
doi = "10.1029/2020JA028663",
url = "http://dx.doi.org/10.1029/2020JA028663",
issn = "2169-9402",
language = "en",
targetfile = "moro_first.pdf",
urlaccessdate = "03 jun. 2024"
}