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arXiv 1201.6501astro-ph.SR
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关于宁静太阳中出现的磁环的偏振特征

On the polarimetric signature of emerging magnetic loops in the quiet-Sun

B. Viticchie

摘要:

在欧米茄形磁回路出现的位置处,斯托克斯V型剖面的丰度由一个瓣占主导地位。出现事件出现在太阳宁静区的日出SOT/SP时间序列中。这样的研究的目的是确认一个预测的基础上出现的磁环的基本几何和物理特性:斯托克斯V型配置文件为主的一个瓣可能是这些结构的主要极化签名。与这一预测相一致,47%的斯托克斯V剖面分析具有大于0.3的无符号振幅不对称性,而在安静太阳中,丰度约为30%。无论振幅不对称性的阈值是什么,都发现相对于安静太阳的这种过剩是一致的。这样的结果证明了迄今为止提出的用于解释环出现事件的物理方案的优点,并可能促使使用由一个波瓣主导的Stokes V剖面作为一个新的代理,用于在具有良好光谱采样的观测中识别它们。

英文摘要:

The abundance of Stokes V profiles dominated by one lobe at the locations of emergence of Omega-shaped magnetic loops is evaluated. The emergence events were found in Hinode SOT/SP time-sequences of quiet-Sun regions. Such a study has the aim of confirming a prediction based on the basic geometrical and physical properties of emerging magnetic loops: Stokes V profiles dominated by one lobe are possibly the main polarimetric signature of these structures. In agreement with this prediction, 47 % of the Stokes V profiles analyzed has an unsigned amplitude asymmetry larger than 0.3, while in the quiet-Sun the abundance is of about 30 %. This excess with respect to the quiet-Sun is found consistently for whatever value of the threshold on the amplitude asymmetry. Such a result proves the goodness of the physical scenarios so far proposed for the interpretation of loop emergence events and may prompt the use of Stokes V profiles dominated by one lobe as a new proxy for their identification in observations with a good spectral sampling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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