GPS Observations of Increases in Ionospheric Total Electron Contents Associated with Solar Flares

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  • Heki Kosuke
    Dept. Natural History Sci., Faculty of Science, Hokkaido University

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  • 太陽フレアに伴う電離層全電子数上昇のＧＰＳ観測
  • タイヨウ フレア ニ トモナウ デンリソウ ゼン デンシスウ ジョウショウ ノ GPS カンソク

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Abstract

Phase differences between the two carrier waves from Global Positioning System (GPS) sat ellites provide information on numbers of electrons integrated along line-of-sights. Sudden increase of electron densities in ionosphere is caused by enhanced ultraviolet flux by solar flares. Here I report two examples of such observations using globally deployed GPS stations. Dependence of such increase on solar zenith angles is addressed using stations distributed over the sunlit hemisphere. The height distribution of the electron increase is also discussed using data from stations along the night-day boundary.

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