Near-Earth bursty bulk flows and AE index
Near-Earth bursty bulk flows and AE index
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DOI：
10.1007/s11431-008-0256-9
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
L. Q. Zhang;Jiankui Shi;Zhen-xing Liu;Wolfgang Baumjohann;Zhiwei Ma;M. Dunlop;C. Carr;H. Rème
中科院分区：
文献类型：
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作者：
L. Q. Zhang;Jiankui Shi;Zhen-xing Liu;Wolfgang Baumjohann;Zhiwei Ma;M. Dunlop;C. Carr;H. Rème
利用2004-2006年每年6 - 11月TC-1卫星磁强计和离子等离子体分析仪的4s分辨率资料，统计分析了对流和场向突发流（FABF）的发生率。在平静期和亚暴过程中都发生了近地爆发性整体流（NEBBF）。在一般情况下，磁场和等离子体密度开始振荡的NEBBF的出现与AE指数的明显增加。NEBBF期间AE指数的增加在平静时间和亚暴过程中均超过100 nT。统计分析表明，在AE指数的不同阶段，FABFs的出现率基本相同，但在AE指数的增长阶段，NEBBFs的出现率要高得多，说明NEBBFs与亚暴的增长和扩展阶段有直接关系。观测结果表明，来自中磁尾的相当数量的BBF可以进入近地尾，并在亚暴爆发中起重要作用。
With the 4-s resolution data of the magnetometer and the ion plasma analyzer on TC-1 from June to November of each year during the period of 2004-2006, we statistically analyzed the occurrence rate of both convective and field-aligned bursty flows (FABFs). A near-Earth bursty bulk flow (NEBBF) occurred during both the quiet time and substorm process. In general, the magnetic field and the plasma density began oscillating with the appearance of the NEBBF associated with a distinct increase of the AE index. The increase of AE index during the NEBBF was more than 100 nT in both quiet time and substorm process. The statistical analysis indicated that the occurrence rates of the FABFs were nearly the same in the different stages of the AE index, but the occurrence rate of the NEBBFs was much higher in the growth stage of the AE index, indicating that the NEBBFs were directly related to the growth and expansion phases of the substorm. The observations suggested that the quite large number of BBFs from the mid magnetotail could enter into the near-Earth tail and play important role in triggering the substorm onset.