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Alternative TitleStatistical Study on IMF By Control of the FAC in the Magnetotail
程征伟; 史建魁; 刘振兴
Source Publication空间科学学报
Keyword场向电流 等离子体片边界层 行星际磁场by分量
Abstract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 By分量(IMF|By|<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 By分量为负时 进行比较, IMF By分量为正时场向电流的发生率更高, 约55.6%; 当IMF|By| >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 |By|的增大而增大, 且具有很好的线性相关关系, 当IMF By分量 为正时, 相关性更好; 场向电流密度也随IMF |By|的增大而增大, 同样具 有很好的线性相关关系, 当IMF By分量为正时, 相关性更好. 以上结果表 明, IMF By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.
Other AbstractUsing the magnetic field data from Cluster spacecraft and the Interplanetary Magnetic Field (IMF) data from ACE spacecraft, the effect of IMF By component (IMF |By|<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 By 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 By is positive compared with that when the IMF By is negative. When the IMF |By| 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 |By|, and when the IMF By is positive, this correlation is better. The FAC density also has an obvious positive correlation with the IMF |By|, and when the IMF By is positive, this correlation is better. The above results show that the IMF By 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 By is positive).
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Document Type期刊论文
Corresponding Author程征伟
Recommended Citation
GB/T 7714
程征伟,史建魁,刘振兴. 行星际磁场By分量对磁尾场向电流的控制作用[J]. 空间科学学报,2016,36(2):139-146.
APA 程征伟,史建魁,&刘振兴.(2016).行星际磁场By分量对磁尾场向电流的控制作用.空间科学学报,36(2),139-146.
MLA 程征伟,et al."行星际磁场By分量对磁尾场向电流的控制作用".空间科学学报 36.2(2016):139-146.
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