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arXiv 1610.05554astro-ph.SR
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太阳大气中的前半影磁冠

The pre-penumbral magnetic canopy in the solar atmosphere

David MacTaggart, Salvo Guglielmino, Francesca Zuccarello

摘要:

半影是磁对流在高度倾斜(垂直方向)的磁场中的表现。太阳黑子的半影最初倾向于沿着本影的弧形成,该弧与通量出现的主要区域相对。高度倾斜的磁场如何沿着本影的对映曲线集中,至少在最初,这个问题还有待回答。以前的观测研究表明,存在某种形式的上覆磁冠,作为半影的祖先。我们认为,这种覆盖的磁冠层是磁场如何进入大气层的结果,因此,是新兴区域的一部分。我们表明,通过扭曲的磁通管出现的模拟,高度倾斜的磁场檐篷形成优先在光球上方的所需位置。

英文摘要:

Penumbrae are the manifestation of magnetoconvection in highly inclined (to the vertical direction) magnetic field. The penumbra of a sunspot tends to form, initially, along the arc of the umbra antipodal to the main region of flux emergence. The question of how highly inclined magnetic field can concentrate along the antipodal curves of umbrae, at least initially, remains to be answered. Previous observational studies have suggested the existence of some form of overlying magnetic canopy which acts as the progenitor for penumbrae. We propose that such overlying magnetic canopies are a consequence of how the magnetic field emerges into the atmosphere and are, therefore, part of the emerging region. We show, through simulations of twisted flux tube emergence, that canopies of highly inclined magnetic field form preferentially at the required locations above the photosphere.

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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