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arXiv 0907.2750astro-ph.SR
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磁结构对本影点特性的影响

Characteristic Dependence of Umbral Dots on their Magnetic Structure

Hiroko Watanabe, Reizaburo Kitai, Kiyoshi Ichimoto

摘要:

2007年3月1日,日野太阳光学望远镜在NOAA 10944的一个稳定黑子中观测到了本影点。观测程序包括蓝色连续图像和Fe I 630 nm线的光谱偏振分布。一个自动检测算法的UDs应用于2小时的连续蓝色连续图像,并使用所获得的数据,计算的寿命,大小和自行车的UDs。黑子的磁结构是通过对分光偏振剖面的反演得到的。计算了UD的参数(大小、寿命、出现率、自行)与磁场(场强、倾角、方位角)的相关性,结果表明:(1)UD的寿命和大小几乎不变,与其出现处的磁场强度无关; (2)随着出射点的场倾角的增大,UDs的运动速度增大。(3)在强倾斜场区,UDs的运动方向几乎平行于磁场的水平分量方向,而在弱倾斜场区,UDs几乎没有自行。我们的结果描述了太阳黑子磁对流的基本性质。我们将讨论我们的结果与Schussler & Vogler(2006)和Rempel等人(2009)最近的MHD模拟进行比较。

英文摘要:

Umbral dots (UDs) were observed in a stable sunspot in NOAA 10944 by the Hinode Solar Optical Telescope on 2007 March 1. The observation program consisted of blue continuum images and spectropolarimetric profiles of Fe I 630 nm line. An automatic detection algorithm for UDs was applied to the 2-hour continuous blue continuum images, and using the obtained data, the lifetime, size, and proper motion of UDs were calculated. The magnetic structure of the sunspot was derived through the inversion of the spectropolarimetric profiles. We calculated the correlations between UD's parameters (size, lifetime, occurrence rate, proper motion) and magnetic fields (field strength, inclination, azimuth), and obtained the following results: (1) Both the lifetime and size of UDs are almost constant regardless of the magnetic field strength at their emergence site. (2) The speed of UDs increases as the field inclination angle at their emergence site gets larger. (3) The direction of movement of UDs is nearly parallel to the direction of the horizontal component of magnetic field in the region with strongly inclined field, while UDs in the region with weakly inclined field show virtually no proper motion. Our results describe the basic properties of magnetoconvection in sunspots. We will discuss our results in comparison to recent MHD simulations by Schussler & Vogler (2006) and Rempel et al. (2009).

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