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arXiv 0810.2463astro-ph
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半影丝的结构和动力学

Structure and dynamics of penumbral filaments

B. Ruiz Cobo, L. R. Bellot Rubio

摘要:

对太阳黑子的高分辨率观测揭示了在半影的明亮细丝中存在着暗核。在这里,我们提出了固定的解决方案,在分层半影组成的近水平的磁通量管嵌入在一个更强和更垂直的领域的热传递方程。管与外界介质处于水平力学平衡状态。这个模型产生了明亮的灯丝与黑暗的核心作为一个结果的等离子体的通量管内的密度较高,这将转移表面的光学深度统一向更高(冷)层。结果表明,黑子半影的剩余亮度是Evershed流的自然结果,直径约250 km的磁通量管可以解释黑子半影的形态。

英文摘要:

High-resolution observations of sunspots have revealed the existence of dark cores inside the bright filaments of the penumbra. Here we present the stationary solution of the heat transfer equation in a stratified penumbra consisting of nearly horizontal magnetic flux tubes embedded in a stronger and more vertical field. The tubes and the external medium are in horizontal mechanical equilibrium. This model produces bright filaments with dark cores as a consequence of the higher density of the plasma inside the flux tube, which shifts the surface of optical depth unity toward higher (cooler) layers. Our results suggest that the surplus brightness of the penumbra is a natural consequence of the Evershed flow, and that magnetic flux tubes about 250 km in diameter can explain the morphology of sunspot penumbra.

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