Three dimensional computer simulations on the spontaneous fast reconnection model

我们提出了自发快速重联模型，并通过精确的三维计算机模拟研究了其基本物理机制。在各种物理条件下，由于重联区（微观）异常电阻率与整体重联流之间的正反馈作用，包含慢激波的快速重联机制可以发生剧烈的演化，因此，自发的快速重联演化被认为是长电流片系统的非线性不稳定性。结果表明，一个大规模的快速冲击站在前面的环顶部的磁回路形成直接从这个理论模型的结果，也形成了一个大规模的等离子体团向外传播。最近，模拟模型被扩展到三维，自发快速重联模型的详细的3D功能已经澄清。将自发快速重联模型应用于亚暴爆发时在远尾叶观测到的所谓旅行压缩区（TCR），定性和定量地解释了TCR的基本特征。我们还将该模型应用于亚暴电流楔，被称为一个长期存在的问题，并首次展示了磁层电流楔的剧烈演化。此外，将电流楔演化应用于双带耀斑，表明电流楔演化能较好地解释太阳耀斑的主要特征。

We have proposed the spontaneous fast reconnection model, and its basic physical mechanism has been studied by precise three-dimensional computer simulations. It has been definitely demonstrated in a variety of physical situations that the fast reconnection mechanism involving standing slow shocks can drastically evolve because of the positive feedback between the(microscopic)anomalous resistivity in the reconnection region and the global reconnection flow, so that the spontaneous fast reconnection evolution is considered to be a nonlinear instability of the long current sheet system. It is shown that a large-scale magnetic loop formation with a fast shock standing just ahead of the loop top directly results from this theoretical model; also, a large-scale plasmoid is formed and propagates outwards. Recently, the simulation models are extended to three dimensions, and the detailed 3D features of the spontaneous fast reconnection model have been clarified. The spontaneous fast reconnection model is applied to the so-called Traveling Compression Regions (TCR) observed in the distant tail lobe in association with substorm onset, and the basic features are exactly explained both qualitatively and quantitatively. We also apply the model to the substrom current wedge, known as a long-standing question, and demonstrate the drastic evolution of the magnetospheric current wedge for the first time. In addition, the current wedge evolution is applied to two-ribbon flares, and it is demonstrated that major features of solar flares can pertinently explained.