The relations between density of FACs in the plasma sheet boundary layers and Kp index
The relations between density of FACs in the plasma sheet boundary layers and Kp index
复制标题
等离子体片边界层FAC密度与Kp指数的关系
DOI:
10.1007/s11431-011-4545-3
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发表时间:
2011-08
期刊:
影响因子:
--
通讯作者:
程征伟
中科院分区:
文献类型:
--
作者:
程征伟
We have studied 172 field-aligned currents (FACs) cases observed by the ClusterII satellites when they crossed the plasma sheet boundary layer (PSBL) in the magnetotail from July to October 2001. We mainly analyzed the relationship between the characteristic of FACs at the PSBL in magnetotail and the Kp index. The main results indicated the followings: 1) In the different geomagnetic activity levels, the relative occurrence of FACs in PSBL increased monotonically with geomagnetic activity. 2) The density of FACs in PSBL increased monotonically with Kp index. In the storm main phase, the density of FACs increased dramatically, the maximum FACs approximately equaled 19.05 nA m−2 while Kp equaled 5. 3) The variation of FACs density in PSBL was consistent with the variation of the Kp index. However, when AE<800 nT, FACs density in PSBL increased with increasing AE, and when AE>800 nT, it decreased with increasing AE. Therefore, our results suggested that the FACs density in PSBL had a closer correlation with Kp index.
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