@Article{AbreuRAANVFJGM:2019:EfX2So,
author = "Abreu, A. J. de and Roberto, M. and Alves, M. A. and Abalde, J. R.
and Nogueira, P. A. B. and Venkatesh, K. and Fagundes, P. R. and
Jesus, Rodolfo de and Gende, M. and Martin, I. M.",
affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
Instituto Federal de Educa{\c{c}}{\~a}o, Ci{\^e}ncia e
Tecnologia de S{\~a}o Paulo (IFSP) and {National Atmospheric
Research Laboratory (NARL)} 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 Tecnol{\'o}gico de Aeron{\'a}utica
(ITA)}",
title = "Effects of X2-class solar flare events on ionospheric GPS-TEC
andradio waves over Brazilian sector",
journal = "Advances in Space Research",
year = "2019",
volume = "63",
number = "11",
pages = "3586--3605",
month = "June",
keywords = "Solar flare, Ionosphere, GPS, Ionosonde.",
abstract = "In this investigation, we present and discuss the effects of 6
X2-class solar flare events in the ionospheric F region over
Brazilian sector that occurred during 2013 to 2015. For this
investigation, we present the vertical total electron content
(VTEC) observations from nearly 120 Global Positioning System
(GPS) receivers all over the Brazilian sector for each event.
Also, ionospheric sounding observations obtained in Sao Jose dos
Campos (23.2 degrees S, 45.9 degrees W, dip latitude 17.6 degrees
S; hereafter referred to as SJC), under the southern crest of the
equatorial ionospheric anomaly (EIA), Brazil, are presented. The
observations show that the greatest TEC impact occurs with the EUV
fluxes increases lasting for more than one hour and when the solar
active region is located close to the solar disc center. We
present a detailed study of the efficiency of the EUV flux with
wavelengths ranging from 0.1 to 190 nm for the F region
ionization. The largest increase of Delta TEC occurs below the
magnetic equator line, covering mainly the central, northeast,
southeast and south regions, which includes the equatorial
ionospheric anomaly (EIA) region. The ionograms show partial or
total fade out in the echoes traces observed causing blackouts of
radio signals of up to 60 min, which can have serious consequences
to technological systems of public and private agencies around
Brazilian sector. This study can help to better understand the
effects of solar flares in the ionospheric F region.",
doi = "10.1016/j.asr.2019.02.020",
url = "http://dx.doi.org/10.1016/j.asr.2019.02.020",
issn = "0273-1177 and 1879-1948",
language = "en",
targetfile = "abreu_effects.pdf",
urlaccessdate = "27 abr. 2024"
}