行星际磁场<em>B</em><sub>y</sub>分量对磁尾场向电流的控制作用

程征伟; 史建魁; 刘振兴

doi:10.11728/cjss2016.02.139

行星际磁场B_y分量对磁尾场向电流的控制作用

doi: 10.11728/cjss2016.02.139

中国科学院国家空间科学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(41374169,41474137,41274146)和国家重点实验室专项基金项目共同资助

详细信息

通讯作者:
程征伟,E-mail:zwcheng@spaceweather.ac.cn

中图分类号: P353.2
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出版历程
- 收稿日期: 2015-01-29
- 修回日期: 2015-05-29
- 刊出日期: 2016-03-15

Statistical Study on IMF B_y Control of the FAC in the Magnetotail

State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190

摘要

摘要: 利用Cluster卫星的磁场探测数据及ACE卫星的行星际磁场(IMF)探测数据, 研究了IMF B_y分量(IMF|B_y|<10nT)对磁尾等离子体片边界层 (PSBL)区场向电流发生率和密度的影响. 研究显示: 与IMF B_y分量为负时进行比较, IMF B_y分量为正时场向电流的发生率更高, 约55.6%; 当IMF|B_y| >4nT时场向电流发生率占总发生率的77.4%; 场向电流发生率随 IMF |B_y|的增大而增大, 且具有很好的线性相关关系, 当IMF B_y分量为正时, 相关性更好; 场向电流密度也随IMF |B_y|的增大而增大, 同样具有很好的线性相关关系, 当IMF B_y分量为正时, 相关性更好. 以上结果表明, IMF B_y分量对磁尾场向电流的产生和变化具有很强的控制作用, 并且昏向IMF变化与场向电流变化的关系更加密切.
- 场向电流 /
- 等离子体片边界层 /
- 行星际磁场B_y分量
Abstract: Using the magnetic field data from Cluster spacecraft and the Interplanetary Magnetic Field (IMF) data from ACE spacecraft, the effect of IMF B_y component (IMF |B_y|<10nT) on the Field-Aligned Current (FAC) occurrence rate and density at the Plasma Sheet Boundary Layer (PSBL) in the magnetotail is investigated. 1657 FAC cases from July to October in 2001 and 2004 were selected for analysis. We present that the IMF B_y component plays a very important role in controlling the occurrence rate and density of the FAC in the PSBL in the magnetotail. The FAC occurrence is higher (about 55.6%) when the IMF B_y is positive compared with that when the IMF B_y is negative. When the IMF |B_y| is more than 4nT, the occurrence rate of FAC is about 77.4%. The FAC occurrence in the magnetotail has an obvious positive correlation with the IMF |B_y|, and when the IMF B_y is positive, this correlation is better. The FAC density also has an obvious positive correlation with the IMF |B_y|, and when the IMF B_y is positive, this correlation is better. The above results show that the IMF B_y component has strong control on the occurrence and density of the FAC cases in the magnetotail, and that the change of FAC is closely associated with the duskward IMF (the IMF B_y is positive).
- Field-aligned currents /
- Plasma sheet boundary layers /
- Interplanetary magnetic field B_y component

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参考文献(33)

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