Some properties of field-aligned electron events in high-altitude polar regions  

作　　者：ZHANG ZiYing SHI JianKui ZHOU MingQuan CHENG ZhengWei ZHOU Hua 

机构地区：[1]College of Information Science and Technology, Beijing Normal University, Beijing 100875, China [2]State Key Laboratory of Space Weather, National Space Science Center, Beijing 100190, China [3]College of Applied Arts and Science of Beijing Union University, Beijing 100191, China

出　　处：《Science China Earth Sciences》2016年第2期436-444,共9页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41274146;41474137 and 41374169);the Specialized Research Fund for State Key Laboratory in China

摘　　要：Using data from the Cluster spacecraft from January 2003 to December 2004, we perform a statistical study on some properties of the field-aligned electron(FAE) events and interplanetary magnetic field(IMF) By dependence of FAE events with different durations in high-altitude polar regions. A total of 1335 FAE events were observed by the C3 spacecraft. More down-flowing events were observed in the Southern Hemisphere, and more up-flowing events were observed in the Northern Hemisphere. It proves that down-flowing events mainly originate from magnetosphere or solar wind and up-flowing events are mainly derived from ionosphere. Short-lifetime events showed a morning concentration in the magnetic local time distribution, and long-lifetime events were concentrated both before and after noon. For the IMF By dependence of the FAE events, short-lifetime events were much affected by IMF By and resulted in a morning concentration, while the long-lifetime events were almost unaffected by IMF By. With further analysis, we determined that the short-lifetime and long-lifetime events had different sources.Using data from the Cluster spacecraft from January 2003 to December 2004, we perform a statistical study on some properties of the field-aligned electron （FAE） events and interplanetary magnetic field （IMF） By dependence of FAE events with different durations in high-altitude polar regions. A total of 1335 FAE events were observed by the C3 spacecraft. More down-flowing events were observed in the Southern Hemisphere, and more up-flowing events were observed in the Northern Hem- isphere. It proves that down-flowing events mainly originate from magnetosphere or solar wind and up-flowing events are mainly derived from ionosphere. Short-lifetime events showed a morning concentration in the magnetic local time distribution, and long-lifetime events were concentrated both before and after noon. For the IMF By dependence of the FAE events, short-lifetime events were much affected by IMF By and resulted in a morning concentration, while the long-lifetime events were almost unaf- fected by IMF By. With further analysis, we determined that the short-lifetime and long-lifetime events had different sources.

关 键 词：Field-aligned electron IMF By High-altitude polar region 

分 类 号：P353[天文地球—空间物理学]