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The Influence of the Great Solar Flare of 24 April 1984 on the Ionospheric Total Electron Content

Ma Jian-min, Long Qi-li   

  1. China Research Institute of Radiowave Propagation
  • Received:1985-02-02 Revised:1900-01-01 Online:1986-04-24 Published:1986-04-24

Abstract: Sudden increases of the ionospheric total electron content (TEC) during the great solar flare burst near 2356 UTon 24 April 1984 were simultaneously observed at Xin-xiang (35.3°N, 113.9°E) and Chongqing(29.5°N, 106.4°E) by means of Faraday rotation measurements of the VHFsignals from the Japanese geostationary satellite ETS-II. These sudden increases lasted three and a half minutes, and the values of TECincreases at Xinxiang and Chongqing reached 9.4×1016 and 14.3×1016 ele./m2 respectively. The phenomenon recorded by polarimeters is compared with results from neighbouring ionosondes and VLF phase-locked receiver. The analysis shows that there are appreciable increases of electron density both in the ionospheric D-region and the F-region and the latter is the main part of the sharp TEC increases.

Key words: Mid-latitude Es, Communication subsystem, PAT subsystem