Current singularities in planar magnetic X points of finite compressibility
Current singularities in planar magnetic X points of finite compressibility
复制标题
有限压缩性平面磁 X 点的当前奇点
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Y. Litvinenko
中科院分区：
文献类型：
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作者：
I. Craig;Y. Litvinenko
本文讨论了非电阻性、线束缚的磁性X点中电流奇点的形成。有人指出，虽然气体压力抑制当前的奇异性发展时，严格的反平行，一维磁场内爆，压力可能是不太有效的，在更现实的情况下，二维磁场。详细的非线性弛豫计算在不同水平的可压缩性确认，奇异性是存在的，即使在不可压缩的限制，但其强度，由电流密度的振幅和形态，是相当大的减少。通过计算峰值电流密度与分辨率的比例来量化奇异性强度。的缩放显示，局部电流结构可以预期只有可忽略不计的气体压力。数值结果表明，包含气体压力有效地失速快速磁重联线束缚X点几何。
The formation of current singularities in nonresistive, line-tied magnetic X points is addressed. It is pointed out that, although gas pressure suppresses the current singularity development when strictly antiparallel, one-dimensional magnetic fields implode, the pressure is likely to be less effective in the more realistic case of two-dimensional magnetic fields. Detailed nonlinear relaxation computations at various levels of compressibility confirm that singularity is present even in the incompressible limit, but its strength, as determined by the amplitude and morphology of the current density, is considerably reduced. The singularity strength is quantified by computing the scalings of the peak current density with resolution. The scalings show that localized current structures can be expected only for negligible gas pressures. The numerical results imply that the inclusion of gas pressure effectively stalls fast magnetic reconnection in line-tied X-point geometries.