Plasma-beta dependence of the fast reconnection mechanism in an initially force-free current sheet
Plasma-beta dependence of the fast reconnection mechanism in an initially force-free current sheet
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DOI：
10.1063/1.3655449
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发表时间：
2011-10
影响因子：
2.2
通讯作者：
M. Ugai
中科院分区：
文献类型：
--
作者：
M. Ugai
本文系统地研究了在广泛的等离子体β（β）范围内初始无力电流片的自发快速重联机制；在我们之前的工作中，研究了 β = 0.15 的特殊情况。在每种情况下，快速重连的演化以及由此产生的结构在质量上与已经报道的 β = 0.15 情况下的结构相似。从数量上讲，对于较低的血浆β，快速重联演化变得更加快速和剧烈。对于非常低的等离子体β（β = 0.01或0.02）的情况，在产生的快速重联射流和大尺度等离子体团区域中，等离子体温度极大地升高到比其初始值大几乎1/β倍的值。一旦快速重联机制在局部点状区域被点燃，其最终建立的基本结构几乎稳定地维持，导致等离子体团随时间膨胀并向外传播。因此，特征重连寄存器...
The present paper systematically studies the spontaneous fast reconnection mechanism in an initially force-free current sheet in a wide range of plasma beta (β); in our previous work it was studied for a special case of β = 0.15. In each case, the evolution as well as the resulting structure of the fast reconnection is qualitatively similar to the one that was already reported for the case of β = 0.15. Quantitatively, the fast reconnection evolution becomes more rapid and drastic for the lower plasma beta. For the cases of very low plasma beta (β = 0.01 or 0.02), the plasma temperature is extremely enhanced to the value almost 1/β times larger than its initial value in the resulting fast reconnection jet and large-scale plasmoid regions. Once the fast reconnection mechanism is ignited in a local spot-like region, its basic structure eventually established is sustained almost steadily, giving rise to the plasmoid swelling with time and propagating outwards. Accordingly, the characteristic reconnection regi...