Ion dynamics in steady collisionless driven reconnection.
Ion dynamics in steady collisionless driven reconnection.
复制标题
稳定无碰撞驱动重连接中的离子动力学。
作者：
W. Pei;R. Horiuchi;T. Sato
利用一种新的二维全粒子模拟方法研究了开放系统中的稳态无碰撞驱动重联。重连率由外部驱动电场控制。离子的弯曲运动在离子动力学中起着重要的作用，它控制着离子量的空间结构。虽然电流主要由电子携带，但电流层具有离子曲折轨道尺度的半宽度，因为密度分布由离子曲折运动控制。因此，重联的全局动力学行为主要由离子动力学控制。通过有限拉莫尔半径效应产生的静电场导致在离子耗散区域中的平衡电流方向上的电子加速和通过强化曲折运动的离子加热。我们的结果与Yamada等人[Phys.Plasmas 7，1781（2000）]和Hus等人[Phys.Rev.Lett. 84，3859（2000）]。
Steady collisionless driven reconnection in an open system is investigated by means of a new two-dimensional full-particle simulation. The reconnection rate is controlled by an external driving electric field. Ion-meandering motion plays an important role in ion dynamics which controls the spatial structures of ion quantities. Although the electric current is predominantly carried by electrons, the current layer has the half-width of the ion-meandering orbit scale because the density profile is controlled by massive-ion motion. Thus, the global dynamic behavior of reconnection is dominantly controlled by ion dynamics. An electrostatic field generated through the finite-Larmor-radius effect leads to electron acceleration in the equilibrium current direction in the ion-dissipation region and ion heating by intensifying meandering motion. Our results are in agreement with the recent experimental results of Yamada et al. [Phys. Plasmas 7, 1781 (2000)] and of Hus et al. [Phys. Rev. Lett. 84, 3859 (2000)].