arXiv 2206.044842022-06-09astro-ph.SRphysics.plasm-phphysics.space-ph

双带耀斑上方大尺度电流片中撕裂模控制的磁重联的二维模拟

Two-dimensional modeling of the tearing-mode-governed magnetic reconnection in the large-scale current sheet above the two-ribbon flare

Yining Zhang, Jing Ye, Zhixing Mei, Yan Li, Jun Lin

备注：: 22 pages, 10 figures; Accepted for publication in Research in Astronomy and Astrophysics
DOI：: 10.1088/1674-4527/ac751a

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摘要：

我们尝试用二维数值模拟的方法，用Lundquist数$S=10^6$来模拟在重力分层的太阳大气中的双带耀斑期间的磁重联。我们发现撕裂模不稳定性导致了重联电流片（CS）内部的非均匀湍流，并引发了重联的快速相。快速重联带来了额外的磁场耗散，从而明显提高了重联率。在CS的能谱显示幂律图案和等离子体团的动力学支配相关的光谱指数。我们注意到，能量耗散发生在100-200 km的$l_{ko}$尺度上，对应的CS厚度在1500 - 2500 km之间，符合泰勒尺度$l_T=l_{ko} S^{1/6}$。终端激波（TS）出现在耀斑环上方的湍流区，是加热耀斑环的重要贡献者。大量的磁能通过TS转换成动能和热能，并且累积加热速率大于动能转移速率。此外，湍流在某种程度上被TS放大，其幅度与TS的局部几何形状有关。

英文摘要：

We attempt to model magnetic reconnection during the two-ribbon flare in the gravitationally stratified solar atmosphere with the Lundquist number of $S=10^6$ using 2D simulations. We found that the tearing mode instability leads to the inhomogeneous turbulence inside the reconnecting current sheet (CS) and invokes the fast phase of reconnection. Fast reconnection brings an extra dissipation of magnetic field which enhances the reconnection rate in an apparent way. The energy spectrum in the CS shows the power-law pattern and the dynamics of plasmoids governs the associated spectral index. We noticed that the energy dissipation occurs at a scale $l_{ko}$ of 100-200~km, and the associated CS thickness ranges from 1500 to 2500~km, which follows the Taylor scale $l_T=l_{ko} S^{1/6}$. The termination shock(TS) appears in the turbulent region above flare loops, which is an important contributor to heating flare loops. Substantial magnetic energy is converted into both kinetic and thermal energies via TS, and the cumulative heating rate is greater than the rate of the kinetic energy transfer. In addition, the turbulence is somehow amplified by TS, of which the amplitude is related to the local geometry of the TS.

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