Model of electron pressure anisotropy in the electron diffusion region of collisionless magnetic reconnection
Model of electron pressure anisotropy in the electron diffusion region of collisionless magnetic reconnection
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DOI：
10.1063/1.3521576
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发表时间：
2010-12-01
影响因子：
2.2
通讯作者：
Biernat, H. K.
中科院分区：
文献类型：
--
作者：
Divin, A.;Markidis, S.;Biernat, H. K.
本文提出了一个新的无碰撞磁重联中电子扩散区电子压力各向异性模型，该模型适用于磁场反平行位形的情况。等离子体的各向异性作为无碰撞耗散的来源进行了研究。通过将中性线附近的电子分成两大类流入和加速的粒子群，可以推导出非对角电子压力分量的简单闭合。这两种电子布居在中性线附近的出现是磁重联中各向异性和无碰撞耗散的原因。粒子在细胞模拟验证所提出的模型，确认第一个存在两个粒子群，第二个非对角电子压力分量的分析结果。此外，进行测试粒子计算以将我们的方法与Fujimoto和Sydora [Phys. Plasmas 16，112309（2009）]的内部电子扩散区域中的电子压力各向异性模型进行比较。(C)2010年美国物理学会。[doi：10.1063/1.3521576]
A new model of the electron pressure anisotropy in the electron diffusion region in collisionless magnetic reconnection is presented for the case of antiparallel configuration of magnetic fields. The plasma anisotropy is investigated as source of collisionless dissipation. By separating electrons in the vicinity of the neutral line into two broad classes of inflowing and accelerating populations, it is possible to derive a simple closure for the off-diagonal electron pressure component. The appearance of these two electron populations near the neutral line is responsible for the anisotropy and collisionless dissipation in the magnetic reconnection. Particle-in-cell simulations verify the proposed model, confirming first the presence of two particle populations and second the analytical results for the off-diagonal electron pressure component. Furthermore, test-particle calculations are performed to compare our approach with the model of electron pressure anisotropy in the inner electron diffusion region by Fujimoto and Sydora [Phys. Plasmas 16, 112309 (2009)]. (C) 2010 American Institute of Physics. [doi:10.1063/1.3521576]