论文标题
磁剪和热力学不对称对自发MHD磁重新连接的影响
Effects of magnetic shear and thermodynamic asymmetry on spontaneous MHD magnetic reconnection
论文作者
论文摘要
使用二维磁水动力学模拟研究了广义情况下磁重新连接的自发演变（具有有关当前纸和磁剪切的热力学不对称性）。我们关注时间进化的渐近状态，即自相似阶段（Nitta等，2001）。 1）在短浆液的前面产生了长的快速冲击，就像在无剪切的热力学不对称情况下一样；但是，剪切的磁成分削弱了冲击。这种快速冲击可以用作粒子加速度位点。 2）较短的浆液侧等离子体在整个纸上浸润较长的浆液。然后，在较长的等离子的相同磁场线上共存的等离子体。这可能会导致有效的血浆混合。 3）热力学不对称和磁剪切在许多数量级中大大降低了重新连接速率。
The spontaneous evolution of magnetic reconnection in generalized situations (with thermodynamic asymmetry regarding the current sheet and magnetic shear) is investigated using two-dimensional magnetohydrodynamic simulation. We focus on the asymptotic state of temporal evolution, i.e., the self-similarly expanding phase (Nitta et al. 2001). 1) A long fast-mode shock is generated in front of the shorter plasmoid as in the shear-less thermodynamically asymmetric case; however, the sheared magnetic component weakens the shock. This fast shock may work as a particle acceleration site. 2) The shorter plasmoid-side plasma infiltrates the longer plasmoid across the current sheet. Then, the plasmas from both sides of the current sheet coexist on the same magnetic field lines in the longer plasmoid. This may result in efficient plasma mixing. 3) The thermodynamic asymmetry and magnetic shear drastically decrease the reconnection rate in many orders of magnitude.
