@InProceedings{BeckerGuedesCandPaulNegr:2015:EsIoRe,
author = "Becker Guedes, F{\'a}bio and Candido, Cl{\'a}udia Maria Nicoli
and Paula, Eurico Rodrigues de and Negreti, Patr{\'{\i}}cia Mara
de Siqueira",
affiliation = "{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 = "Estimation of ionospheric response to solar flares in the
equatorial and low-latitude regions",
year = "2015",
organization = "IUGG General Assembly, 26.",
abstract = "Solar X-ray and extreme ultraviolet (EUV) photons are responsible
for ionizing the terrestrial atmosphere and create the ionosphere.
During solar flares, a fast increase in the electron density at
various altitude regions takes place due to the abrupt enhance of
the X-ray and EUV fluxes toward Earth. With these changes in the
ionosphere, radio communication and navigation can be drastically
affected. The magnitudes of these kind of Space Weather events can
be related to the X-ray peak brightness and the duration, which
drive the intensity of the ionosphere response when the associated
electromagnetic wave hit the sunlit side of the Earth atmosphere.
Other aspects defining the severity of damages to HF radio
communications and LF navigation signals in a certain area are the
local time, the solar zenith angle, and the position of the flare
in the solar disc. In order to improve the understanding of radio
signal loss or degradation in the Brazilian sector due to solar
X-ray emissions, we analyze total electron content (TEC) maps and
curves at selected sites obtained by a GPS network formed by tents
of dual-frequency receivers spread all over Brazilian territory.
We observe different ionospheric local changes during several
X-ray events in the 0.1-0.8 nm range identified by GOES satellite.
Considering the results, we have made an estimation of the
severity and range of ionospheric disturbances in the equatorial
and low-latitude Brazilian region affecting space based
communication for different events based on their
characteristics.",
conference-location = "Prague, Czech Republic",
conference-year = "22 June - 02 July",
urlaccessdate = "29 mar. 2024"
}