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arXiv 1301.6933astro-ph.SR
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太阳表面和大气动力学：光球

Solar surface and atmospheric dynamics: The Photosphere

V. Martinez Pillet

备注：
ISSI Workshop Microphysics of Cosmic Plasmas
发表信息：
Space Science Reviews, 2013
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摘要：

本文综述了宁静太阳的磁性的各个方面。的建议，一个小规模的发电机在颗粒尺度上产生我们所说的安静的太阳场进行了一些详细的研究。尽管发电机的作用已经在数值上得到了证明，但有人认为，目前的模拟仍然远远没有达到太阳上可能存在的复杂性。我们的这种说法的基础上，没有那么多的低磁雷诺数在模拟中使用，但最重要的是，在他们所采用的动力学雷诺数的小。有人认为，在太阳表面的低磁普朗特数可能会造成意想不到的问题，所观察到的互联网领域的识别与发电机行动在颗粒尺度。在更大（和更深）的尺度上，某种形式的湍流发电机是有利的。Hinode观测到的网络间磁场与Hanle测量推断出的磁场之间的比较正朝着类似的描述收敛。它们都被描述为随机取向的，在几百高斯范围内的大部分横向场。这些相似之处使人们更自然地认为它们是一样的。然而，由于观察到的互联网领域的空间分布中的磁通量的大空隙，有人认为，他们是不太可能产生的发电机行动中的晶间巷道。它的结论是，如果发电机是在颗粒尺度上，最终产品可能还没有观察到在目前的空间分辨率和灵敏度与塞曼效应。

英文摘要：

Various aspects of the magnetism of the quiet sun are reviewed. The suggestion that a small scale dynamo acting at granular scales generates what we call the quiet sun fields is studied in some detail. Although dynamo action has been proved numerically, it is argued that current simulations are still far from achieving the complexity that might be present on the Sun. We based this statement not so much on the low magnetic Reynolds numbers used in the simulations but, above all, in the smallness of the kinetic Reynolds numbers employed by them. It is argued that the low magnetic Prandtl number at the solar surface may pose unexpected problems for the identification of the observed internetwork fields with dynamo action at granular scales. Some form of turbulent dynamo at bigger (and deeper) scales is favored. The comparison between the internetwork fields observed by Hinode and the magnetism inferred from Hanle measurements are converging towards a similar description. They are both described as randomly oriented, largely transverse fields in the several hecto-Gauss range. These similarities are ever making more natural to assume that they are the same. However, and because of the large voids of magnetic flux observed in the spatial distribution of the internetwork fields, it is argued that they are not likely to be generated by dynamo action in the intergranular lanes. It is concluded that if a dynamo is acting at granular scales, the end product might have not been observed yet at current spatial resolutions and sensitivities with the Zeeman effect.

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