Magnetic Reconnection via Current Sheets
Magnetic Reconnection via Current Sheets
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DOI：
10.1063/1.865670
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发表时间：
1986-05
影响因子：
4.6
通讯作者：
D. Biskamp
中科院分区：
文献类型：
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作者：
D. Biskamp
在二维不可压缩电阻磁流体力学理论框架下，给出了磁场重联的一般情况。（准）稳态驱动重联的数值研究揭示了在马赫数M=u/vA超过Sweet-Parker重联率MSP=（η/LvA）1/2时电流片的形成。由于电流片的厚度δ不随电阻率η的变化而变化，其长度Δ随着η的减小或M的增大而迅速增大，其可以写成Δ ε（M/MSP）4的形式，使得Δ在参数M/MSP的短范围内达到全局系统尺寸L。结果对边界条件的特殊选择相当不敏感。由于电流片的存在，整个重连过程相当缓慢。这张照片基本上同意Syrovatsky的[苏联。物理JETP 33，933（1971）]理论，并反驳Petschek的[AAS/NASA太阳耀斑物理研讨会，（美国宇航局，华盛顿，DC，1964）第425页]机制的快速磁...
A general picture of magnetic reconnection in the framework of 2‐D incompressible resistive magnetohydrodynamic theory is presented. Numerical studies of (quasi‐) steady‐state driven reconnection reveal current sheet formation for Mach numbers M=u/vA exceeding the Sweet–Parker reconnection rate MSP=(η/LvA)1/2. Since the thickness δ of the current sheet is found to be invariant to a change of the resistivity η, its length Δ increases rapidly with decreasing η or increasing M, which can be written in the form Δ∼(M/MSP)4, so that Δ reaches the global system size L within a short range of the parameter M/MSP. The results are rather insensitive to the particular choice of boundary conditions. Because of the presence of a current sheet, the overall reconnection process is quite slow. This picture essentially agrees with Syrovatsky’s [Sov. Phys. JETP 33, 933 (1971)] theory and disproves Petschek’s [AAS/NASA Symposium on the Physics of Solar Flares, (NASA, Washington, DC, 1964) p. 425] mechanism of fast magnetic ...