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arXiv 1101.3530astro-ph.SR
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耀斑后超拱廊暗巷的模拟

Simulation of dark lanes in post--flare supra--arcades

L. S. Maglione, E. M. Schneiter, A. Costa, S. Elaskar

摘要:

Costa et al.(2009)和Shulz et al.(2010)首次使用两个1.5D的模拟,我们在数值上重现了Verwichte et al.(2005)描述的观测暗流。我们表明,黑暗的轨道可以解释为热等离子体真空上游产生的一个缓慢的磁声冲击波所产生的局部沉积的能量。在这项工作中,我们表明,整体二维结果与观测行为一致。然而,他们显示出轻微的变化的特征参数相对于那些以前发现的。此外,我们确认定性的行为发现在以前的文件,即对于一个给定的数值域的扭结状结构的周期是一个函数的磁场强度:较大的周期与较低的磁场强度。与1D结果相反-其中由于其专门的波导作用,向阳动态与磁场强度无关-在2D模拟中,对于较大的磁场值,向阳速度较大。这可以解释为低日冕等离子体将能量沉积准直到磁场方向的能力。低密度和高温等离子体腔的运动特征一致,具有比邻近介质更大的结构参数β的内部值。因此,空洞似乎是一个整体的非线性相互作用的冲击和波等离子体上下文的出现结构比空洞的等离子体磁结构的环路。

英文摘要:

Using two simulations of 1.5D, for the first time, in Costa et al. (2009) and Shulz et al. (2010) we numerically reproduce the observational dark inflows described in Verwichte et al. (2005). We show that the dark tracks can be explained as hot plasma vacuums generated upstream of a slow magnetoacoustic shock wave produced by a localized deposition of energy. In this work, we show that the overall 2D results are in agreement with the observational behaviour. However they show a slight shift in the characteristic parameter with respect to those found previously. Also, we confirm qualitatively the behaviour found in the previous papers, i.e. for a given numerical domain the period of the kink--like structure is a function of the magnetic field intensity: larger periods are associated with lower magnetic field intensities. Contrary to the 1D result -where the sunward dynamic is independent of the magnetic field intensity due to its exclusively waveguide role- in the 2D simulation the sunward speed is larger for larger values of the magnetic field. This can be interpreted as the capability of the low coronal plasma to collimate the deposition of energy into the magnetic field direction. The moving features consistent of low--density and high--temperature plasma cavities have larger inside values of the structuring parameter beta than the neighboring media. Thus, the voids seem to be the emergence structures of a whole nonlinear interacting plasma context of shocks and waves more than voided plasma loops magnetically structured.

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