Spatial-temporal variations of the ionospheric TEC during the August 2018 geomagnetic storm by BeiDou GEO Satellites

doi:10.11947/j.AGCS.2022.20210013

Abstract

Abstract: Considering the unique geostationary characteristic of the Beidou GEO satellites, the spatial-temporal variations of ionospheric TEC during the geomagnetic storm are studied by using GEO Satellites. The global ionospheric map (GIM) is adopted as an experimental comparison. The results show that the TEC derived from the GEO satellite observations is consistent with the GIM model. Moreover, the GEO TEC can more effectively reflect subtle variations of the ionosphere. The variation and disturbance response characteristics of the ionospheric TEC are significantly different in the latitude direction during the geomagnetic storm in the Asia-Pacific region. The ionospheric TEC mainly presents positive response disturbance during the main phase of the storm in the higher latitudes of the northern and southern hemispheres, while the equatorial and lower latitude areas in the northern hemisphere both produce positive response disturbance with greater intensity and longer duration during the main phase and the recovery phase of the storm. Based on the existing studies, we think that the excitation factors of the anomalous ionospheric disturbance are the enhancement of the eastward prompt penetration electric field and neutral composition change of the thermosphere. In this paper, the experimental results suggest that GEO satellite observations can accurately and effectively monitor the anomalous variation of ionospheric TEC and the disturbance response characteristics generated by TEC at different space locations during geomagnetic storms.

Key words: BeiDou navigation satellite system, GEO satellites, ionospheric TEC, geomagnetic storm, disturbance response

CLC Number:

P227

TANG Jun, GAO Xin, LI Yinjian, ZHONG Zhengyu. Spatial-temporal variations of the ionospheric TEC during the August 2018 geomagnetic storm by BeiDou GEO Satellites[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(3): 317-326.

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