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arXiv 1701.02112astro-ph.SR
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模拟Ellerman类炸弹事件

Simulating Ellerman bomb-like event

S. Danilovic

摘要:

埃勒曼炸弹(EB)似乎是一个整体的现象,可能有相同的基本物理机制的一部分,但观察到的特点,构成了相当大的挑战模型。本研究的目的是调查所提出的机制,适用于环境的电子束,产生所观察到的特征。为此,使用逼真的3D MHD模拟。两种不同的情况下:安静的太阳和一个活跃的区域。这两次运行证实,EB样的增亮与热而致密的等离子体相一致,这与1D和2D建模的预测一致。模拟的类EB现象假设所观察到的火焰状的形式,这取决于正在进行的重联和视角的复杂性。在由H $α$ -翼采样的层处,接近最低温度和低于最低温度,磁场拓扑似乎总是相同的。那里的场线跟踪电流片的基底和重新连接的$\cap$ -环。因此,EB特征是由表面流最强的区域中相反极性的强场补丁的重连引起的。其中最弱的情况下,可以再现定量目前的模拟。

英文摘要:

Ellerman bombs (EBs) seem to be a part of a whole spectrum of phenomena that might have the same underlying physical mechanism, but with observed characteristics which pose a considerable challenge to models. The aim of this study is to investigate whether the proposed mechanism, applied to the circumstances of EBs, produce the observed characteristics. For this, realistic 3D MHD simulations are used. Two different cases are presented: the quiet Sun and an active region. Both runs confirm that EB-like brightenings coincide with hot and dense plasma which is in agreement with predictions of 1D and 2D modellings. The simulated EB-like phenomena assume the observed flame-like form, which depends on the complexity of the ongoing reconnection and the viewing angle. At the layers sampled by H$α$-wings, near temperature minimum and below, the magnetic field topology seem to be always the same. The field lines there trace the base of the current sheet and the reconnected $\cap$-loops. So, the EB features are caused by reconnection of strong-field patches of opposite polarity in the regions where the surface flows are the strongest. The weakest cases among them can be reproduced quantitatively by the current simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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