Impact of 3D Structure on Magnetic Reconnection

被引:5
|
作者
Daldorff, Lars K. S. [1 ,2 ]
Leake, James E. [2 ]
Klimchuk, James A. [2 ]
机构
[1] Catholic Univ Amer, 620 Michigan Ave NE, Washington, DC 20064 USA
[2] NASA, Heliophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
来源
ASTROPHYSICAL JOURNAL | 2022年 / 927卷 / 02期
关键词
D O I
10.3847/1538-4357/ac532d
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Results from 2.5D and 3D studies of the onset and development of the tearing instability are presented, using high-fidelity resistive MHD simulations. A limited parameter study of the strength of the reconnecting field (or shear angle) was performed. An initially simple 1D equilibrium was used, consisting of a modified force-free current sheet, with periodic boundary conditions in all directions. In all cases, the linear and nonlinear evolution led to a primary current sheet between two large flux ropes. The global reconnection rate during this later stage was analyzed in all simulations. It was found that in 2.5D the primary current sheet fragmented owing to plasmoids, and as expected, the global reconnection rate, calculated using multiple methods, increases with the strength of the reconnecting field owing to a stronger Alfven speed. In 3D, the presence of interacting oblique modes of the tearing instability complicates the simple 2.5D picture, entangling the magnetic field of the inflow and introducing a negative effect on the reconnection rate. The two competing effects of stronger Alfven speed and entangling, which both increase with the strength of the reconnecting field, resulted in a decrease in the reconnection rate with increasing reconnecting field. For all simulations, the 3D rates were less than in 2.5D but suggest that as one goes to weak reconnecting field (or strong guide field) the system becomes more 2.5D-like and the 2.5D and 3D rates converge. These results have relevance to situations like nanoflare heating and flare current sheets in the corona.
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页数:12
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