Climatology of the scintillation onset over southern Brazil
This work presents an analysis of the climatology of the onset time of ionospheric scintillations at low latitude over the southern Brazilian territory near the peak of the equatorial ionization anomaly (EIA). Data from L1 frequency GPS receiver located in Cachoeira Paulista (22.4∘ S, 45.0∘ W; dip l...
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Veröffentlicht in: | Annales geophysicae (1988) 2018-04, Vol.36 (2), p.565-576 |
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Zusammenfassung: | This work presents an analysis of the climatology of the onset time of
ionospheric scintillations at low latitude over the southern Brazilian
territory near the peak of the equatorial ionization anomaly (EIA). Data from L1
frequency GPS receiver located in Cachoeira Paulista (22.4∘ S,
45.0∘ W; dip latitude 16.9∘ S), from September 1998 to
November 2014, covering a period between solar cycles 23 and 24, were used in
the present analysis of the scintillation onset time. The results show that
the start time of the ionospheric scintillation follows a pattern, starting
about 40 min earlier, in the months of November and December, when
compared to January and February. The analyses presented here show that such
temporal behavior seems to be associated with the ionospheric prereversal
vertical drift (PRVD) magnitude and time. The influence of solar activity in
the percentage of GPS links affected is also addressed together with the
respective ionospheric prereversal vertical drift behavior. Based on this
climatological study a set of empirical equations is proposed to be used for
a GNSS alert about the scintillation prediction. The identification of this
kind of pattern may support GNSS applications for aviation and oil extraction
maritime stations positioning. Keywords. Ionosphere (ionospheric irregularities; modeling and forecasting) – radio science (space and satellite communication) |
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ISSN: | 1432-0576 0992-7689 1432-0576 |
DOI: | 10.5194/angeo-36-565-2018 |