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高速流前端磁场Bz分量的变化

盛程 傅绥燕 郑昊 白曦 杨彪 王永福

盛程, 傅绥燕, 郑昊, 白曦, 杨彪, 王永福. 高速流前端磁场Bz分量的变化[J]. 空间科学学报, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793
引用本文: 盛程, 傅绥燕, 郑昊, 白曦, 杨彪, 王永福. 高速流前端磁场Bz分量的变化[J]. 空间科学学报, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793
SHENG Cheng, FU Suiyan, ZHENG Hao, BAI Xi, YANG Biao, WANG Yongfu. Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows[J]. Journal of Space Science, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793
Citation: SHENG Cheng, FU Suiyan, ZHENG Hao, BAI Xi, YANG Biao, WANG Yongfu. Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows[J]. Journal of Space Science, 2012, 32(6): 793-803. doi: 10.11728/cjss2012.06.793

高速流前端磁场Bz分量的变化

doi: 10.11728/cjss2012.06.793
基金项目: 国家自然科学基金项目资助(40874086, 41031065)
详细信息
  • 中图分类号: P353

Variation of the Bz Component of Magnetic Field During the Front of Bursty Bulk Flows

  • 摘要: 等离子体片高速流在磁层活动中起着重要作用, 其形成机制以及与背景等离子体的相互作用日益引起关注. 本文利用搭载于Cluster四颗卫星上的磁场和等离子体观测仪器, 对2001和2002两年发生在磁尾等离子体片中高速流事件期间的磁场变化进行了统计研究. 结果表明, 在高速流前端, 伴随着等离子体整体速度的增加, 绝大多数高速流前端磁场的Bz分量经常出现先短暂减小然后剧烈增大的现象, 符合以往利用Geotail卫星观测数据获得的统计特性. 然而个例研究发现Bz的下降与上升常常是不对称的, 且Bz分量下降的程度并不是总能达到反向的程度, 说明这种变化特征并不一定是存在磁结构的表现. 我们认为更多时候这种磁场的变化特征是高速流挤压背景等离子体磁场造成的, 是相互作用的结果. 当偶极化锋面形成后, 由类似间断面的磁场界面反射的热离子产生抗磁效应, 可能对Bz下降形成部分贡献, 而Bz增加则是高速流携带磁通量堆积的效果.

     

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出版历程
  • 收稿日期:  2011-05-26
  • 修回日期:  2012-04-28
  • 刊出日期:  2012-11-15

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