摘要
根据ClusterII卫星的探测数据,对1 839个磁尾等离子体片边界层场向电流事件与行星际磁场(IMF)时钟角Φ的关系进行了统计分析。结果显示等离子体片边界层场向电流的发生率明显受到IMF时钟角的调控:当0°<|Ф|<90°,场向电流发生率随IMF时钟角的变化曲线为一"V"型结构。当90°<Ф<180°时场向电流发生率保持在很高的水平上;当-180°<Ф<-90°时,场向电流的发生率先减小后增大,其拐点在Ф=-130°附近。这说明场向电流不仅受行星际Bz的影响,也受行星际磁场By的影响。
The relationship between the occurrence frequency of field-aligned currents （FACs） at the plasma sheet boundary layers （PSBLs） in magnetotail and the interplanetary magnetic field （IMF） clock angle 6b using 1 839 FACs cases observed by the ClusterII satellites is analyzed. The main results indicated the followings： When 0°〈｜φ}〈90°, the occurrence frequency of FACs varied with the IMF clock angle as a ＂ V＂ structure; When 90°〈φ〈180°, the occurrence frequency of FACs were all in very high levels. When -180°〈φ〈-90°~, the occurrence frequency of FACs decreased firstly and then increased, it turned at φ=-130°. The results indicate that not only IMF Bx but also IMF By controlled the occurrence frequency of FACs.
出处
《科学技术与工程》
北大核心
2012年第10期2272-2275,共4页
Science Technology and Engineering
基金
国家自然科学基金(40804031
41074114
40921063)项目
国家重点实验专项基金资助
关键词
场向电流
等离子体片边界层
IMF时钟角
field-aligned currents plasma sheet boundary layers IMF clock angle
