Suppression of Hall-term effects by gyroviscous cancellation in steady collisionless magnetic reconnection.
Suppression of Hall-term effects by gyroviscous cancellation in steady collisionless magnetic reconnection.
复制标题
通过稳定无碰撞磁重联中的陀螺粘性抵消来抑制霍尔项效应。
DOI：
10.1103/physrevlett.95.045003
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发表时间：
2005
影响因子：
8.6
通讯作者：
R. Horiuchi
中科院分区：
文献类型：
--
作者：
A. Ishizawa;R. Horiuchi
通过全粒子模拟，证明了在二维无碰撞驱动重联的稳态过程中，离子耗散区的形成，其中电子和离子的运动解耦并发生快速磁重联。霍尔项效应由于在离子表面深度和离子弯曲轨道尺度之间的尺度上的回转粘性抵消而被抑制，因此离子被束缚在磁场中。离子弯曲运动产生的非各向异性压张量效应强烈地打破了离子冻结约束，从而在低于离子弯曲轨道尺度的尺度上形成了离子耗散区。在电子耗散区的形成中也观察到了类似的过程。这两个耗散区在平面外的电流密度分布中可以清楚地观察到。
The formation of an ion-dissipation region, in which motions of electrons and ions decouple and fast magnetic reconnection occurs, is demonstrated during a steady state of two-dimensional collisionless driven reconnection by means of full-particle simulations. The Hall-term effect is suppressed due to the gyroviscous cancellation at scales between the ion-skin depth and ion-meandering-orbit scale, and thus ions are tied to the magnetic field. The ion frozen-in constraint is strongly broken by nongyrotropic pressure tensor effects due to ion-meandering motion, and thus the ion-dissipation region is formed at scales below the ion-meandering-orbit scale. A similar process is observed in the formation of an electron-dissipation region. These two dissipation regions are clearly observed in an out-of-plane current density profile.