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arXiv 1301.0341astro-ph.SR
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耦合太阳表面和日冕:日冕旋转,阿尔文波驱动的极柱

Coupling the solar surface and the corona: coronal rotation, Alfvén wave-driven polar plumes

R. F. Pinto, R. Grappin, M. Velli, A. Verdini

摘要:

日冕对地表和次地表扰动的动力学响应取决于色球层结,特别是这些层结反射或传输入射阿尔文波的效率。虽然最好将色球层包括在用于研究这种现象的数值模拟中,但这往往是不可行的。我们定义并测试了一个简单的近似,允许日冕现象的研究,同时考虑到参数化的色球反射率。我们解决了表面旋转到日冕的传输问题和阿尔文波产生极地羽流的问题(平托等人,2010,2011)。我们发现,需要一个高(但部分)有效色球反射率正确地描述在日冕的角动量平衡和表面的差异旋转向上传输的方式。阿尔文波驱动的极地羽流在反射率的大范围内保持其特性,但当达到全反射的极限时,它们会变得突发(并最终中断)。

英文摘要:

The dynamical response of the solar corona to surface and sub-surface perturbations depends on the chromospheric stratification, and specifically on how efficiently these layers reflect or transmit incoming Alfvén waves. While it would be desirable to include the chromospheric layers in the numerical simulations used to study such phenomena, that is most often not feasible. We defined and tested a simple approximation allowing the study of coronal phenomena while taking into account a parametrised chromospheric reflectivity. We addressed the problems of the transmission of the surface rotation to the corona and that of the generation of polar plumes by Alfvén waves (Pinto et al., 2010, 2011). We found that a high (yet partial) effective chromospheric reflectivity is required to properly describe the angular momentum balance in the corona and the way the surface differential rotation is transmitted upwards. Alfvén wave-driven polar plumes maintain their properties for a wide range of values for the reflectivity, but they become bursty (and eventually disrupt) when the limit of total reflection is attained.

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