论响应于位磁场压缩或膨胀的电流片的形成
On the formation of current sheets in response to the compression or expansion of a potential magnetic field
摘要：
考虑了初始势磁场的压缩或膨胀。Janse & Low [2009，ApJ，690，1089]最近提出，在体积变形之后，磁场的相关最低能量状态是另一个潜在的磁场，其通常包含切向不连续性（电流片）。在这里，我们检查这种情况下直接使用数值松弛方法，完全保留了磁场的拓扑结构。结果表明，在Janse & Low所讨论的磁场中，只有含有磁零点的磁场在理想弛豫过程中产生电流奇异性，而不含磁零点的磁场则在有限非零电流下向光滑的无力平衡态弛豫.
英文摘要：
The compression or expansion of a magnetic field that is initially potential is considered. It was recently suggested by Janse & Low [2009, ApJ, 690, 1089] that, following the volumetric deformation, the relevant lowest energy state for the magnetic field is another potential magnetic field that in general contains tangential discontinuities (current sheets). Here we examine this scenario directly using a numerical relaxation method that exactly preserves the topology of the magnetic field. It is found that of the magnetic fields discussed by Janse & Low, only those containing magnetic null points develop current singularities during an ideal relaxation, while the magnetic fields without null points relax toward smooth force-free equilibria with finite non-zero current.
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