Long time scale evolution of collisionless driven reconnection in a two-dimensional open system
Long time scale evolution of collisionless driven reconnection in a two-dimensional open system
复制标题
二维开放系统中无碰撞驱动重连接的长时标演化
DOI：
10.1063/1.1375150
复制
发表时间：
2001
影响因子：
2.2
通讯作者：
Tetsuya Sato
中科院分区：
文献类型：
--
作者：
W. Pei;R. Horiuchi;Tetsuya Sato
采用基于开放边界模型的二维全粒子模拟方法，研究了开放系统中无碰撞驱动重联的长时间尺度演化。无碰撞重联是由等离子体流外部驱动的，它主要受外部驱动电场的两个关键参数，即强度E0和早期非均匀尺度Xd的控制。强度E0控制重联率，而刻度Xd控制当前层形状，从而控制磁场配置。结果表明，在我们的模拟参数范围内，无碰撞重联的动力学行为对Xd比较敏感，对E0的影响较小。在较小的XD情况下，系统向重新连接速率与外部驱动场E0平衡的稳定状态演化。随着XD的增大，由于原始X点附近磁岛的频繁激发，重联演化呈现出间歇性现象。
Long time scale evolution of collisionless driven reconnection in an open system is investigated by means of two-dimensional full particle simulation based on an open boundary model. Collisionless reconnection is externally driven by the plasma inflow, which is mainly controlled by two key parameters of an external driving electric field, i.e., the strength E0 and the early nonuniformity scale xd. The strength E0 controls reconnection rate, while the scale xd controls the current layer shape and thus the magnetic-field configuration. It is found that the dynamical behavior of collisionless reconnection is sensitive to xd and less to E0 in our simulation parameter range. In the small xd case, the system evolves toward a steady state in which the reconnection rate is balanced with the external driving field E0. As xd increases, the reconnection evolution exhibits an intermittent phenomenon because of the frequent excitation of magnetic islands near the original X point.