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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 2 | Copyright

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 565-576, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 03 Apr 2018

Regular paper | 03 Apr 2018

Climatology of the scintillation onset over southern Brazil

Jonas Sousasantos1, Alison de Oliveira Moraes2, José H. A. Sobral1, Marcio T. A. H. Muella3, Eurico R. de Paula1, and Rafael S. Paolini4 Jonas Sousasantos et al.
  • 1Instituto Nacional de Pesquisas Espaciais-INPE, São José dos Campos, São Paulo, 12.227-010, Brazil
  • 2Instituto de Aeronáutica e Espaço-IAE, São José dos Campos, São Paulo, 12.228-904, Brazil
  • 3Universidade do Vale do Paraíba-UNIVAP, Institute of Research and Development-IP&D, São José dos Campos, São Paulo, 12.244-000, Brazil
  • 4EMBRAER, São José dos Campos, São Paulo, 12.227-901, Brazil

Abstract. 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 40min 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.

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Short summary
This work presents an analysis of the scintillation onset over the southern Brazil based on data from two solar maximum periods and simulation of the ionospheric conditions before the scintillation onset. The results shows some patterns which may help to prevent several satellite-based technological applications suffering disruptions due to scintillation issues.
This work presents an analysis of the scintillation onset over the southern Brazil based on data...