Fast resistive reconnection regime in the nonlinear evolution of double tearing modes.
Fast resistive reconnection regime in the nonlinear evolution of double tearing modes.
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DOI：
10.1103/physrevlett.99.185004
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发表时间：
2007-11
影响因子：
8.6
通讯作者：
Zheng-Xiong Wang;Xiaogang Wang;J. Dong;Y. Lei;Y. Long;Z. Mou;W. Qu
中科院分区：
文献类型：
--
作者：
Zheng-Xiong Wang;Xiaogang Wang;J. Dong;Y. Lei;Y. Long;Z. Mou;W. Qu
对非线性双撕裂模位相进行了数值研究。前两个阶段导致磁岛的形成和增长，紧随其后的是一个快速重联阶段，在相邻磁分离合并和磁岛耦合的过程驱动下完成这一过程。这种快速增长可以理解为岛屿相互作用的结果，相当于稳定向内的通量边界驱动。首次研究了各相的电阻率依赖关系，并用标度分析方法进行了说明。结果表明，在ETA(1/2)标度的早期Sweet-Parker相之后，卢瑟福体系中ETA(1)标度的缓慢非线性相之后是ETA(1/5)标度的快速重联相.
Phases of nonlinear double tearing modes are studied numerically. The first two phases lead to the formation and growth of magnetic islands and are followed by a fast reconnection phase to complete the process, driven by a process of neighboring magnetic separatrices merging and magnetic islands coupling. The fast growth can be understood as a result of the island interaction equivalent to a steadily inward flux boundary driven. Resistivity dependences for various phases are studied and shown by scaling analysis for the first time. It is found that after an early Sweet-Parker phase with a eta(1/2)-scale, a slow nonlinear phase in a Rutherford regime with a eta(1)-scale is followed by the fast reconnection phase with a eta(1/5)-scale.