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• 日球层物理和太阳系探测 • Previous Articles     Next Articles

Analysis on Relativistic Electron Flux Enhancement Event at GEO in April 2010

ZHENG Jinlei1,2, ZHONG Qiuzhen1, CHEN Liangxu3, LIU Siqing1, DING Zhu4   

  1. 1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049;
    3. Changsha University of Science and Technology, Changsha 410114;
    4. China International Nuclear Fusion Energy Program Execution Center 100862
  • Received:2011-04-25 Revised:2011-11-07 Online:2012-07-15 Published:2012-07-15

Abstract: The relativistic electron flux enhancement event at GEO in April 2010 is analyzed in contrasting with other 6 similar events from 2004 to 2010. Solar wind and geomagnetic conditions which might trigger this event were analyzed. Analytical results indicate that the relatively weaker magnetic storms were prone to make the high flux part of relativistic electrons closer to GEO orbit, and whistler wave acceleration mechanism probably played important roles. The injection depth of seed electrons was closely related to magnetic storm intensity. Dst index curve is well fitted with the lower edge of higher flux region of 30~100keV electrons. The injection depth of seed electrons determined the region where mass of >300keV electrons appeared. Because of the relatively weak storms in the relativistic electron flux enhancement event, the seed electrons injected into a shallow region which was close to geosynchronous orbit, leading to relativistic electron flux abnormally enhancement in geosynchronous orbit. The intense substorms in relativistic electron flux enhancement event at GEO in April 2010, which generated sufficient seed electrons and enhanced the wave-particle interaction, was an essential factor leading to relativistic electrons flux enhancement.

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