Study of the Enhancement Events of Relativistic Electron at the Geosynchronous Orbit

作     者：B. S. Xue 

作者机构：Center for Space Sciences and Applied Research Chinese Academy of Sciences Beijing 100080 China 

出 版 物：《空间科学学报》 (Chinese Journal of Space Science)

年 卷 期：2005年第25卷第5期

页      面：383-386页

核心收录：

学科分类：070802[理学-空间物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：Supported by the China-Russia Joint Research Center on Space Weather Chinese Academy of Sciences 

主　　题：地球 轨道 电子 太阳风 随机事件 

摘      要：The high flux of energetic electron on geostationary orbit can induce many kinds of malfunction of the satellite there, within which the bulk-charging is the most significant that several broadcast satellite failures were confirmed to be due to this effect. The electron flux on geostationary orbit varies in a large range even up to three orders accompanied the passage of interplanetary magnetic cloud and the following geomagnetic disturbances. Upon the investigation of electron flux enhancement events, two types of events were partitioned as recurrent events and random ones. Both of the two kinds of events relate to the interplanetary conditions such as solar wind parameters, IMF etc and their evolution characters as well. As for the recurrent events, we found that, (1) all of the events exhibits periodic recurrence about 27 days, (2) significant increase of electron flux relates to interplanetary index and characters of their distribution, (3) the electron flux also has relation to solar activity index. An artificial neural network was constructed to estimate the flux I day ahead. The random electron flux enhancement events are rare and present different distribution figures to the recurrent ones. The figure of the random events and the conditions of their occurrence is also discussed in this paper.