论文标题
MMS测量的磁尾电子扩散区域的2D重建
2D reconstruction of magnetotail electron diffusion region measured by MMS
论文作者
论文摘要
在近地空间中无碰撞磁重新连接的模型被明显地描述为2D或3D。在2D动力学模型中，电子流体的冷冻定律通常会被涉及电子轨道大小设定的结构的层流动力学打破，而在3D模型中，电子扩散区域的宽度宽了，通过湍流效应扩大。我们介绍了对现场航天器的观测值的分析，从地球上与活动重新连接区域的偶然遇到的磁尾，将观测值映射到2D空间结构域上。尽管该事件可能受到低频3D动力学的干扰，但电子扩散区域的结构与2D动力学模拟的结果保持一致。因此，该事件代表了2D动力学和层层重新连接模型的唯一验证。
Models for collisionless magnetic reconnection in near-Earth space are distinctly characterized as 2D or 3D. In 2D kinetic models, the frozen-in law for the electron fluid is usually broken by laminar dynamics involving structures set by the electron orbit size, while in 3D models the width of the electron diffusion region is broadened by turbulent effects. We present an analysis of in situ spacecraft observations from the Earth's magnetotail of a fortuitous encounter with an active reconnection region, mapping the observations onto a 2D spatial domain. While the event likely was perturbed by low-frequency 3D dynamics, the structure of the electron diffusion region remains consistent with results from a 2D kinetic simulation. As such, the event represents a unique validation of 2D kinetic, and laminar reconnection models.
