近地磁尾中由扰动不稳定性引起的准分界线层
Quasi-separatrix Layers Induced by Ballooning Instability in Near-Earth Magnetotail
摘要：
近地磁尾中的磁重联过程在几何和动力学上可以是高度三维的，尽管磁尾配置本身由于黄昏-黎明方向的对称性而几乎是二维的。这种重联过程可以由非线性气球不稳定性的3D动力学引起。在这项工作中，我们探讨了全球三维几何形状的重联过程中引起的气球不稳定性在近地磁尾通过检查准分界线层的分布与等离子体形成在整个三维域的磁尾配置，使用以前开发的太阳物理学的背景下的算法。准分界线层（QSL）的三维分布以及它们的演化直接遵循气球不稳定性在时间和空间上的非线性发展过程中的等离子体团的形成。这种密切的相关性表明，气球和相应的重联过程之间的强耦合。它进一步证实了内在的三维性质的气球诱导等离子体团的形成和重联过程中，在几何和动力学。此外，三维QSL几何的重建可以提供一种替代手段，用于识别三维重联网站的磁尾从数值模拟和卫星观测的位置和时间。
英文摘要：
Magnetic reconnection processes in the near-Earth magnetotail can be highly 3-dimensional (3D) in geometry and dynamics, even though the magnetotail configuration itself is nearly two dimensional due to the symmetry in the dusk-dawn direction. Such reconnection processes can be induced by the 3D dynamics of nonlinear ballooning instability. In this work, we explore the global 3D geometry of the reconnection process induced by ballooning instability in the near-Earth magnetotail by examining the distribution of quasi-separatrix layers associated with plasmoid formation in the entire 3D domain of magnetotail configuration, using an algorithm previously developed in context of solar physics. The 3D distribution of quasi-separatrix layers (QSLs) as well as their evolution directly follows the plasmoid formation during the nonlinear development of ballooning instability in both time and space. Such a close correlation demonstrates a strong coupling between the ballooning and the corresponding reconnection processes. It further confirms the intrinsic 3D nature of the ballooning-induced plasmoid formation and reconnection processes, in both geometry and dynamics. In addition, the reconstruction of the 3D QSL geometry may provide an alternative means for identifying the location and timing of 3D reconnection sites in magnetotail from both numerical simulations and satellite observations.
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