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
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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:
Sci China Ser E-Tech Sci
影响因子:
--
通讯作者:
程征伟
程征伟
中科院分区:
其他
文献类型:
--
作者:
程征伟

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本文研究了2001年7 ~ 10月期间,由美国宇航局二号卫星观测到的172个穿过磁尾等离子体片边界层(PSBL)的场向电流(FACs)事例。我们主要分析了磁尾PSBL的FACs特征与Kp指数的关系。结果表明:1)在不同的地磁活动水平下,PSBL中FACs的相对出现率随地磁活动的增加而单调增加。2)PSBL中FACs密度随Kp指数的增加而单调增加。在风暴主相中,FACs的密度急剧增加,最大FACs约为19.05 nA m−2,而Kp为5。3)PSBL中FACs密度的变化与Kp指数的变化一致。当AE 800 nT时,PSBL中FACs密度随AE的增加而增加,当AE 800 nT时,PSBL中FACs密度随AE的增加而减少。因此,我们的研究结果表明,在PSBL中的FACs密度与Kp指数有更密切的相关性。
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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