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arXiv 1802.01309astro-ph.SR
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太阳光球层结对流的尺度选择

Scale Selection in the Stratified Convection of the Solar Photosphere

M. Kessar, D. W. Hughes, E. Kersale, K. A. Mizerski, S. M. Tobias

摘要:

我们研究了层结在确定湍流滞弹性对流尺度中的作用。出于在太阳光球对流中观察到的尺度范围,我们进行局部数值模拟对流的一系列密度对比在大的域。我们分析了欧拉和拉格朗日统计的对流,并表明,增加分层移动的规模最充满活力的结构中的流到更小的尺度;此外,垂直到水平的对流的相对振幅随分层增加而减小。我们讨论了我们的研究结果的太阳mesogranulation问题的影响。

英文摘要:

We examine the role of stratification in determining the scale for turbulent anelastic convection. Motivated by the range of scales observed in convection at the solar photosphere, we perform local numerical simulations of convection for a range of density contrasts in large domains. We analyse both the Eulerian and Lagrangian statistics of the convection and demonstrate that increasing the stratification shifts the scale of the most energetic structures in the flow to smaller scales; furthermore, the relative amplitude of vertical to horizontal flows in the convection decreases with increasing stratification. We discuss the implications of our results to the issue of solar mesogranulation.

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