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arXiv 0704.3135astro-ph
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宁静太阳单光谱中两条光球线的相反磁极性

Opposite magnetic polarity of two photospheric lines in single spectrum of the quiet Sun

R. Rezaei, R. Schlichenmaier, W. Schmidt, O. Steiner

摘要:

本文通过对微弱的光谱偏振信号的研究,研究了宁静太阳光球磁场的结构。我们采取了一系列的斯托克斯光谱的Fe I 630.15 nm和630.25 nm线在一个安静的太阳区域附近的磁盘中心,使用POLIS分光偏振仪在德国特内里费岛的VTT。这两条线的线芯形成于大气层的不同高度。数据的3 $σ$噪声水平约为1.8 $\times 10^{-3} I_{c}$。我们提出了同时间和同空间斯托克斯- $V$配置文件的Fe I 630 nm线对,其中两条线显示在一个单一的光谱相反的极性。我们计算合成线的配置文件,并再现这些光谱与两个组件的模型大气:一个非磁性组件和磁性组件。磁性元件由两个极性相反的磁性层组成:上面的磁性层向上移动,下面的磁性层向下移动。在这两者之间,有一个温度升高的区域。在单一光谱中出现极性相反的Stokes- $V$线对可以理解为太阳光球层中的一次磁重联事件。我们证明,这样的场景是现实的,但解决方案可能不是唯一的。

英文摘要:

We study the structure of the photospheric magnetic field of the quiet Sun by investigating weak spectro-polarimetric signals. We took a sequence of Stokes spectra of the Fe I 630.15 nm and 630.25 nm lines in a region of quiet Sun near the disk center, using the POLIS spectro-polarimeter at the German VTT on Tenerife. The line cores of these two lines form at different heights in the atmosphere. The 3$σ$ noise level of the data is about 1.8 $\times 10^{-3} I_{c}$. We present co-temporal and co-spatial Stokes-$V$ profiles of the Fe I 630 nm line pair, where the two lines show opposite polarities in a single spectrum. We compute synthetic line profiles and reproduce these spectra with a two-component model atmosphere: a non-magnetic component and a magnetic component. The magnetic component consists of two magnetic layers with opposite polarity: the upper one moves upwards while the lower one moves downward. In-between, there is a region of enhanced temperature. The Stokes-$V$ line pair of opposite polarity in a single spectrum can be understood as a magnetic reconnection event in the solar photosphere. We demonstrate that such a scenario is realistic, but the solution may not be unique.

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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