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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 2
Nat. Hazards Earth Syst. Sci., 13, 375–384, 2013
https://doi.org/10.5194/nhess-13-375-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nat. Hazards Earth Syst. Sci., 13, 375–384, 2013
https://doi.org/10.5194/nhess-13-375-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Feb 2013

Research article | 15 Feb 2013

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Y. B. Yao1,2, P. Chen1,3, S. Zhang1, and J. J. Chen1 Y. B. Yao et al.
  • 1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
  • 2Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
  • 3College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China

Abstract. Observations from the South African TrigNet global navigation satellite system (GNSS) and vertical total electron content (VTEC) data from the Jason-1 satellite were used to analyze the variations in ionospheric electron density profiles over South Africa before and after the severe geomagnetic storms on 15 May 2005. Computerized ionospheric tomography (CIT) was used to inverse the 3-D structure of ionospheric electron density and its response to the magnetic storms. Inversion results showed that electron density significantly increased at 10:00 UT, 15 May compared with that at the same period on 14 May. Positive ionospheric storms were observed in the inversion region during the magnetic storms. Jason-1 data show that the VTEC observed on descending orbits on 15 May significantly increased, whereas that on ascending orbits only minimally changed. This finding is identical to the CIT result.

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