Wave properties in the magnetic reconnection diffusion region with high β: Application of the k‐filtering method to Cluster multispacecraft data
Wave properties in the magnetic reconnection diffusion region with high β: Application of the k‐filtering method to Cluster multispacecraft data
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DOI：
10.1029/2010ja015335
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发表时间：
2010-12
影响因子：
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通讯作者：
Shiyong Huang;Meng Zhou;F. Sahraoui;X. Deng;Y. Pang;Z. Yuan;Q. Wei;J. Wang;Xueying Zhou
中科院分区：
文献类型：
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作者：
Shiyong Huang;Meng Zhou;F. Sahraoui;X. Deng;Y. Pang;Z. Yuan;Q. Wei;J. Wang;Xueying Zhou
[1]磁场重联是实验室和天体物理等离子体中一个重要的物理过程。等离子体波被认为是磁场重联的耗散机制。本文分析了小导场、高β磁尾重联扩散区中低频波的性质。利用K-滤波方法对Cluster空间飞行器测量的磁场数据进行处理，发现扩散区的低频波是高度倾斜的传播模式。我们比较了测量的色散关系与理论计算的线性（热）双流体和Vlasov-Maxwell理论。结果表明，在等离子体β较高的扩散区，观测到的波符合Alfven-Whistler波模的色散关系。与以前的模拟和观测结果的比较进行了讨论。
[1] Magnetic reconnection is a crucial physical process in laboratory and astrophysical plasmas. Plasma waves are believed to provide the dissipation mechanism in magnetic reconnection. In this paper we analyze the properties of low-frequency waves in a magnetotail reconnection diffusion region with a small guide field and high β. Using the k-filtering method on the magnetic field data measured by Cluster spacecraft, we found that low-frequency waves in the diffusion region were highly oblique propagating mode. We compared the measured dispersion relation with theoretical ones calculated using the linear (hot) two-fluid and Vlasov-Maxwell theory. It is found that the observed waves in the diffusion region (with high plasma β) follow the dispersion relation of the Alfven-Whistler wave mode. Comparisons with previous simulations and observational results are also discussed.