@Article{ConceiçãoSantosMRFABPC:2019:OcMoEx,
author = "Concei{\c{c}}{\~a}o Santos, Fredson and Muella, M{\'a}rcio T.
A. H. and Resende, Laysa Cristina Ara{\'u}jo and Fagundes, Paulo
Roberto and Andrioli, Vania F{\'a}tima and Batista, Paulo Prado
and Pillat, Valdir G. and Carrasco, Alexander J.",
affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and
{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} 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 {Universidade do Vale do Para{\'{\i}}ba (UNIVAP)}
and {Universidad de Los Andes}",
title = "Occurrence and modeling examination of sporadic-E layers in the
region of the South America (Atlantic) magnetic anomaly",
journal = "Journal of Geophysical Research: Space Physics",
year = "2019",
volume = "124",
number = "11",
pages = "9676--9694",
month = "Nov.",
keywords = "E-region model, meteor radar, SAMA region, sporadic-E layer, tidal
winds.",
abstract = "In this work, the occurrence of different types of sporadic-E
layers (Es) was described for two stations located in the region
of the South America Magnetic Anomaly: Jatai and Sao Jose dos
Campos. The results show the hourly and monthly values of the Es
occurrences and presented five types of layers (cusp, high, flat,
low, and slant), with the flat/low types (Es-f/l) being the most
frequent over both stations. We also analyzed the Es layer
parameters of blanketing frequency (f(b)Es) and top frequency
(f(t)Es) obtained from ionosonde data during storm-time periods,
in order to investigate possible evidences of energetic
particle-induced E-layer ionization. The results revealed
increases in the values of the nighttime f(t)Es and f(b)Es, which
can be related to the particle precipitation in the South America
Magnetic Anomaly region. Additionally, we investigated the roles
of the wind shear mechanism in the formation of the Es types by
using a modified form of the Ionospheric E-Region Model (MIRE),
which incorporates tidal winds obtained from meteor radar data.
Furthermore, the electron densities deduced from f(b)Es parameter
were compared with the maximum electron densities obtained from
MIRE simulations. Depending on local time and season, the initial
results revealed for both stations some discrepancies between
modeled and measured electron densities. However, a better fitting
was obtained when the amplitudes of the zonal/meridional wind
components were adjusted by some factor, which may be attributed
to the possible effects of day-to-day tidal wind variability and
their interaction with gravity and planetary waves.",
doi = "10.1029/2018JA026397",
url = "http://dx.doi.org/10.1029/2018JA026397",
issn = "2169-9402",
language = "en",
targetfile = "santos_occurrence-compactado.pdf",
urlaccessdate = "24 set. 2024"
}