Climatology of ionospheric amplitude scintillation on GNSS signals at south American sector during solar cycle 24
Tipo
Artigo
Data de publicação
2022
Periódico
Journal of Atmospheric and Solar-Terrestrial Physics
Citações (Scopus)
8
Autores
Macho E.P.
Correia E.
Spogli L.
Tadeu de Assis Honorato Muella M.
Correia E.
Spogli L.
Tadeu de Assis Honorato Muella M.
Orientador
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Título de Volume
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Resumo
© 2022 Elsevier LtdScintillations are caused by ionospheric irregularities and can affect the propagation of trans-ionospheric radio signals. One way to understand and predict the impact of such irregularities on Global Navigation Satellite System (GNSS) signals is through the spatial/temporal characterization of the scintillation's climatology during different phases of a solar cycle covering different latitudes and longitudes. This characterization is performed using amplitude scintillation index S4, during the full solar cycle 24, in the South American (SA) sector. The investigation considers the diurnal, daily, and seasonal variation of S4 index for climatological purpose, and the goal of this study is to investigate the scintillations covering a large spatial scale during the full solar cycle 24. The characterization shows a latitudinal asymmetry, whereas at the south, the scintillations were more frequent and their peak was more distant from the magnetic equator, which can be attributed by the South Atlantic Magnetic Anomaly (SAMA), and/or by the transequatorial meridional neutral winds. It also shows a longitudinal asymmetry, where the scintillations at the eastern sector occurred between November and February, while at the western sector, they occurred during the months of October, November, February and March, which can be attributed to the difference between the magnetic and geographic equators. The occurrence of scintillations during two distinct geomagnetic storms with similar storm time in the SA sector is also presented.
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Assuntos Scopus
Amplitude scintillation , Cycle covering , EIA , Global Navigation Satellite Systems , Ionospheric irregularities , Irregularity , Radio signals , Solar cycle , Spatial temporals , System signals