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arXiv 1209.3370astro-ph.SR
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暗腔中静日区上方观测到的慢磁声波

Slow Magneto-acoustic Waves Observed above Quiet-Sun Region in a Dark Cavity

Jiajia Liu, Zhenjun Zhou, Yuming Wang, Rui Liu, Bin Wang, Chijian Liao, Chenglong Shen, Huinan Zheng, Bin Miao, Zhenpeng Su, S. Wang

摘要:

波在诊断日冕和日冕加热中各种结构的等离子体性质方面起着至关重要的作用。慢磁声波是一种重要的磁流体力学波。在过去的几十年里,许多慢MA波被检测到以上的活动区和冕洞,但很少发现其他地方。在这里,我们调查了一个“龙卷风”状的结构组成的准周期性条纹在一个黑暗的空腔内约40- 110毫米以上的安静的太阳区域2011年9月25日。我们的分析表明,这些条纹实际上是慢MA波列。这些波列的性质,包括相速度、压缩比、动能密度等,与已报道的慢MA波相似,只是慢MA波的周期约为50 s,比典型的报道值(3--5 min)短得多。

英文摘要:

Waves play a crucial role in diagnosing the plasma properties of various structures in the solar corona and coronal heating. Slow magneto-acoustic (MA) waves are one of the important magnetohydrodynamic waves. In past decades, numerous slow MA waves were detected above the active regions and coronal holes, but rarely found elsewhere. Here, we investigate a `tornado'-like structure consisting of quasi-periodic streaks within a dark cavity at about 40--110 Mm above the quiet-Sun region on 2011 September 25. Our analysis reveals that these streaks are actually slow MA wave trains. The properties of these wave trains, including the phase speed, compression ratio, kinetic energy density, etc., are similar to those of the reported slow MA waves, except that the period of these waves is about 50 s, much shorter than the typical reported values (3--5 minutes).

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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