Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster
Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster
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Cluster观测到的与尖锐偶极锋相关的动力学结构和波特性
DOI：
10.5194/angeo-30-97-2012
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发表时间：
2012-01
影响因子：
1.9
通讯作者：
Wang, Q. Q.
中科院分区：
文献类型：
--
作者：
Huang, S. Y.;Zhou, M.;Deng, X. H.;Yuan, Z. G.;Pang, Y.;Wei, Q.;Su, W.;Li, H. M.;Wang, Q. Q.
在亚暴期间，Cluster航天器在磁尾观测到多个偶极锋（DF）。这些DF是动力学结构，嵌入在爆发的等离子体流中，并（主要）向地球和黎明方向移动。在DF层中检测到强电场、平行和垂直电流。这些前层是能量耗散区（负载区），其中电磁场的能量被转移到等离子体的热能和动能。这种耗散主要由电子控制。DF区周围等离子体波增强：小波分析结果表明，前层离子回旋频率附近的波活动是由Alfven离子回旋不稳定性引起的; DF区前后和期间均检测到哨声波，这是由电子温度各向异性触发的，与高能电子通量的增强相一致。这些波的观测对于了解亚暴期间DF和电子的演化具有重要意义。我们讨论了DFs的产生机制，并认为这些DFs是在瞬时重联过程中产生的，然后向地球传播。
Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfven ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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