论文标题
混乱的野外线会导致冠状环的快速重新连接吗？
Do chaotic field lines cause fast reconnection in coronal loops?
论文作者
论文摘要
在过去的十年中，Boozer认为三维（3D）磁重新连接从根本上与二维（2D）重新连接有所不同，因为任何一对相邻线之间的分离几乎总是在3D磁场中几乎呈指数增长在距离上的成倍增加。根据Boozer的说法，此功能使3D现场映射混乱，并对小的非理想效应呈指数敏感。因此，3D重新连接可能没有强烈的电流表。我们通过以下脚下脚点运动驱动的酒杯冠状环路模型的理想和抵抗性还原磁流体动力学模拟来测试Boozer的理论[A. H. Boozer和T. Elder，《等离子体物理学》 28，062303（2021）]。我们的仿真结果与他们的预测明显不同。理想的仿真表明，由于降低的模型方程中缺少项，Boozer和Elder低估了当前密度的强度。此外，不同lundquist数字的电阻模拟表明，最大电流密度与lundquist数字线性而不是对数尺度。
Over the past decade, Boozer has argued that three-dimensional (3D) magnetic reconnection fundamentally differs from two-dimensional (2D) reconnection due to the fact that the separation between any pair of neighboring field lines almost always increases exponentially over distance in a 3D magnetic field. According to Boozer, this feature makes 3D field-line mapping chaotic and exponentially sensitive to small non-ideal effects; consequently, 3D reconnection can occur without intense current sheets. We test Boozer's theory via ideal and resistive reduced magnetohydrodynamic simulations of the Boozer-Elder coronal loop model driven by sub-Alfvenic footpoint motions [A. H. Boozer and T. Elder, Physics of Plasmas 28, 062303 (2021)]. Our simulation results significantly differ from their predictions. The ideal simulation shows that Boozer and Elder under-predict the intensity of current density due to missing terms in their reduced model equations. Furthermore, resistive simulations of varying Lundquist numbers show that the maximal current density scales linearly rather than logarithmically with the Lundquist number.
