@Article{PaulaOCNBMCAMJM:2019:IoIrBe,
author = "Paula, Eurico Rodrigues de and Oliveira, Cesar B. A. de and Caton,
Ronald G. and Negreti, Patr{\'{\i}}cia Mara de Siqueira and
Batista, Inez Staciarini and Martinon, Andr{\'e} Ricardo Fazanaro
and Cunha Neto, Ac{\'a}cio and Abdu, Mangalathayil Ali and
Monico, Jo{\~a}o F. G. and Jonas, Sousasantos and Moraes, Alison
O.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Air Force
Research Laboratory} 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 {Universidade Estadual
Paulista (UNESP)} and {Instituto Tecnol{\'o}gico de
Aeron{\'a}utica (ITA)} and {Instituto de Aeron{\'a}utica e
Espa{\c{c}}o (IAE)}",
title = "Ionospheric irregularity behavior during the September 6-10, 2017
magnetic storm over Brazilian equatorial-low latitudes",
journal = "Earth, Planets and Space",
year = "2019",
volume = "71",
pages = "42",
month = "Apr.",
keywords = "Ionospheric irregularity, Ionospheric scintillation, Magnetic
storm, Magnetospheric electric field penetration,
Counter-electrojet, Plasma irregularity zonal velocity.",
abstract = "The September 6-10, 2017 two-step magnetic storm was caused by an
X9 solar flare followed by a CME. The SSC that occurred at 23:43
UT on day 06 when Sym-H reached about 50 nT, was due to a sudden
increase in solar wind. The first step of the storm was caused by
a B-z southward incursion on day 07. The magnetic index K-p
reached 08, and the Sym-H magnetic index reached a minimum value
of -146 nT on day 08 at 01:08 UT, ending the main phase. On day
07, the solar wind intensified once again and the auroral index AE
reached 2500 nT. During the recovery phase of this first storm,
there was another B-z southward incursion on day 08 at 13:56 UT
when Sym-H reached -115 nT, and K-p reached a value of 08.33,
marking the second step of the storm. In this work, the
ionospheric irregularity over SAo Luis (02.5 degrees S, 44.3
degrees W, dip lat -04.67 degrees) was studied using data from the
VHF, Digisonde and GPS receivers. Electron density data from the
satellite SWARM-A were also analyzed for those orbits close to SAo
Luis, and they presented large fluctuations during the storm night
of 07/08. To analyze the latitudinal effects of the storm on the
plasma irregularities, GPS data from 6 Novatel receivers were
used. The vertical plasma drifts during daytime hours were
determined using magnetometer data and during the evening using
ionogram data. Compared to the 'quiet' days of September 2017, the
VHF and GPS S4 amplitude scintillation indices increased
substantially during the night of 07/08 when there was a strong
intensification in the vertical plasma drift due to a prompt
penetration under shielding magnetospheric electric field of
eastward polarity. On the other hand, on the night of 08/09 the
ionospheric scintillation was completely inhibited due to the
disturbance dynamo electric field of westward polarity associated
with the first and second storms. The irregularity zonal drifts
measured by a VHF receiver around 24 UT (21 LT) were eastward on
the nights of 05/06 and 06/07; however, during the night of 07/08,
it reversed to westward.",
doi = "10.1186/s40623-019-1020-z",
url = "http://dx.doi.org/10.1186/s40623-019-1020-z",
issn = "1880-5981",
language = "en",
targetfile = "paula_ionospheric.pdf",
urlaccessdate = "27 abr. 2024"
}