Division of Theoretical Astronomy, National Astronomical Observatory, 2-21-1 Ohsawa, Mitaka, Tokyo 181-8588, Japan.
Phys Rev Lett. 2012 Dec 28;109(26):265004. doi: 10.1103/PhysRevLett.109.265004.
The dissipation mechanism in collisionless magnetic reconnection in a quasisteady period is investigated for the antiparallel field configuration. A three-dimensional simulation in a fully kinetic system reveals that a current-aligned electromagnetic mode produces turbulent electron flow that facilitates the transport of the momentum responsible for the current density. It is found that the electromagnetic turbulence is drastically enhanced by plasmoid formations and has a significant impact on the dissipation at the magnetic x-line. The linear analyses confirm that the mode survives in the real ion-to-electron mass ratio, which assures the importance of the turbulence in collisionless reconnection.
在准稳态期间，对平行磁场配置中的无碰撞磁重联的耗散机制进行了研究。在全动力学系统中的三维模拟揭示了电流对齐的电磁模式产生了湍动的电子流，这有助于传输负责电流密度的动量。研究发现，电磁湍动通过形成类星体而大大增强，并且对磁 X 线的耗散有重大影响。线性分析证实，该模式在真实的离子-电子质量比中存在，这保证了湍动在无碰撞重联中的重要性。
