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arXiv 1003.0049astro-ph.SR
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太阳黑子半影区海蛇磁结构的解释

Explanation of the sea-serpent magnetic structure of sunspot penumbrae

I. N. Kitiashvili, L. R. Bellot Rubio, A. G. Kosovichev, N. N. Mansour, A. Sainz Dalda, A. A. Wray

摘要:

最近对太阳黑子的分光偏振观测表明,在半影中部形成了双极磁斑,并向半影外边界传播。这些观测结果被解释为是由太阳表面附近的海蛇磁场引起的(Sainz Dalda & Bellot Rubio 2008)。在这封信中,我们发展了一个三维辐射MHD数值模型来解释海蛇结构和半影磁场线的波动行为。模拟再现所观察到的行为,表明海蛇现象是磁对流在强烈倾斜的磁场的后果。它涉及到几个物理过程:对流结构化,在强的、几乎水平的磁场中的高速翻转对流运动,以及部分冻结的磁力线,和行进的对流波。结果表明,在半影区的双极磁补丁与高速Evershed下降流的相关性。这是第一次,一个三维数值模型的半影结果在向下定向的磁场,一个基本组成部分的太阳黑子半影,一直逃避解释,直到现在。

英文摘要:

Recent spectro-polarimetric observations of a sunspot showed the formation of bipolar magnetic patches in the mid penumbra and their propagation toward the outer penumbral boundary. The observations were interpreted as being caused by sea-serpent magnetic fields near the solar surface (Sainz Dalda & Bellot Rubio 2008). In this Letter, we develop a 3D radiative MHD numerical model to explain the sea-serpent structure and the wave-like behavior of the penumbral magnetic field lines. The simulations reproduce the observed behavior, suggesting that the sea-serpent phenomenon is a consequence of magnetoconvection in a strongly inclined magnetic field. It involves several physical processes: filamentary structurization, high-speed overturning convective motions in strong, almost horizontal magnetic fields with partially frozen field lines, and traveling convective waves. The results demonstrate a correlation of the bipolar magnetic patches with high-speed Evershed downflows in the penumbra. This is the first time that a 3D numerical model of the penumbra results in downward directed magnetic fields, an essential ingredient of sunspot penumbrae that has eluded explanation until now.

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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