行星际磁场对磁尾场向电流发生率的影响

程征伟; 史建魁; 张子迎; 刘振兴

doi:10.11728/cjss2013.04.396

行星际磁场对磁尾场向电流发生率的影响

doi: 10.11728/cjss2013.04.396

中国科学院空间科学与应用研究中心空间天气学国家重点实验室北京 100190

基金项目: 国家自然科学基金项目(41274146, 41074114)和国家重点实验室专项基金共同资助

详细信息

作者简介:
程征伟, zwcheng@spaceweather.ac.cn

中图分类号: P353.2
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出版历程
- 收稿日期: 2012-08-29
- 修回日期: 2013-03-04
- 刊出日期: 2013-07-15

Effect of Interplanetary Magnetic Field on the Field-aligned Currents Occurrence in the Magnetotail

State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190

摘要

摘要: 利用Cluster卫星的磁场和等离子体探测数据, 研究了行星际磁场(IMF)时钟角(clock angle) Φ和锥角(cone angle) θ对磁尾等离子体片边界层(PSBL)区场向电流发生率的影响. 当时钟角Φ >0时, 磁尾场向电流的发生率较高, 这表明磁尾场向电流的发生与昏向太阳风条件更为密切; 当 90°<|Φ|<180°时, 场向电流的发生率较高, 这表明场向电流的发生与南向IMF更为密切. 当锥角θ <30°时(即IMF与日地连线夹角较小时)场向电流的发生率较低. 而当θ> 30°时, 场向电流在90°<|Φ|<180°的情况下发生率明显增大, 这说明南向IMF情况下, 场向电流发生率明显增大. 但是当|Φ|<90°时 (北向IMF情况下), 尽管θ很大, 场向电流的发生率并未明显增大. 当θ>70°时, 且在140°< < i>Φ<160°的行星际磁场条件下, 磁尾等离子体片边界层区场向电流的发生率最大.
- 场向电流 /
- 等离子体片边界层 /
- 行星际磁场 /
- 时钟角 /
- 锥角
Abstract: Using the magnetic field and plasma data from Cluster spacecraft, the effect of Interplanetary Magnetic Field (IMF) clock angle Φ and cone angle θ on the Field-Aligned Currents (FAC) occurrence rate at the Plasma Sheet Boundary layer (PSBL) in the magnetotail is investigated. There were more FAC cases occurred when IMF was within the 0°< Φ< 180° clock angle range comparing with the range of -180°< Φ<0°. It indicated that FAC occurrences were associated with duskward IMF (IMF B_y>0). Also, there were more FAC cases occurred when the IMF was within the 90° < |Φ|< 180° clock angle range. It supported that FAC occurrences were associated with southward IMF (IMF B_z<0). Most of the FAC cases occurred when IMF was within the θ>30° cone angle. In addition, A few of FAC cases occurred when the IMF clock angle was in the θ<30° range regardless of the value of Φ. The occurrence rate of FAC was the largest when θ> 30° and 140°< Φ<160°.
- Field-aligned currents /
- Plasma sheet boundary layers /
- Interplanetary magnetic field /
- Clock angle /
- Cone angle

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参考文献(28)

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