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The nighttime anomalies using Global IGS VTEC Maps
(Elsevier, 2013-02)
In this paper we show the VTEC variations at night, considering their geomagnetic, seasonal and solar activity dependences. The variations are analyzed in two time periods 10 p.m. (pre-midnight) and 2 a.m. (post-midnight); ...
Quasi-biennial oscillation in GPS VTEC measurements
(Elsevier, 2014-07)
The quasi-biennial oscillation, QBO, a well known periodicity in the equatorial stratospheric zonal winds, is also found in ionospheric parameters and in solar and geomagnetic activity indices. Many authors speculated about ...
PCA analysis of the nighttime anomaly in far-from-geomagnetic pole regions from VTEC GNSS data
(Terra Scientific Publishing, 2015-12)
The Weddell Sea Anomaly (WSA) is defined when the nighttime plasma density is greater than the daytime density in the area near the Weddell Sea, more specifically in the region limited by 50° S-70°S in latitude and 225° ...
The northern and southern mid-latitude ionospheric trough using global IGS vTEC maps
(Elsevier, 2020-05)
The aim of this work is the analysis of the mid-latitude ionospheric trough (MIT) using the Global Ionospheric Maps from IGS (GIMs) during the solar minimum, year 2008. This study was performed for different local times, ...
Avaliação da variação do TEC no território brasileiro utilizando dados do IGS no período de 2004 a 2008Evaluation of the TEC variation in Brazilian territory using data from the IGS in the period 2004 to 2008
(Universidade Federal de ViçosaBRGeotecnia; Saneamento ambientalMestrado em Engenharia CivilUFV, 2015)