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arXiv 0712.2983astro-ph
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太阳黑子半影区海蛇场线的探测

Detection of sea-serpent field lines in sunspot penumbrae

A. Sainz Dalda, L. R. Bellot Rubio

摘要:

我们调查的空间分布的磁极性在半影的一个点观察非常接近磁盘中心。高空间分辨率,高节奏的磁图采取的窄带滤波器成像仪在本研究中使用。他们提供了连续和稳定的测量光球Fe I 630.25线长时间。我们发现了小规模的,细长的,双极磁结构,出现在半影中间,并径向向外移动穿过半影。它们出现在半影的垂直场之间,并且可以与容纳埃弗谢德流的水平场相关联。它们中的许多穿过外部半影边界,成为太阳黑子护城河中移动的磁性特征。我们确定这些结构的属性,包括它们的大小,自行车,足迹分离,和寿命。两极斑块可以解释为是由海蛇场线产生的,这些场线起源于中间半影,最终以移动的磁性特征的形式离开斑点。这种场线的存在已经从较低角分辨率的分光偏振测量的斯托克斯反演中推断出来,但这是第一次直接成像。我们的观测为半影磁场的未梳理结构提供了又一证据。

英文摘要:

We investigate the spatial distribution of magnetic polarities in the penumbra of a spot observed very close to disk center. High-spatial resolution, high-cadence magnetograms taken with the Narrowband Filter Imager aboard Hinode are used in this study. They provide continuous and stable measurements in the photospheric Fe I 630.25 line for long periods of time. We discover small-scale, elongated, bipolar magnetic structures that appear in the mid penumbra and move radially outward across the penumbra. They occur in between the more vertical fields of the penumbra, and can be associated with the horizontal fields that harbor the Evershed flow. Many of them cross the outer penumbral boundary, becoming moving magnetic features in the sunspot moat. We determine the properties of these structures, including their sizes, proper motions, footpoint separation, and lifetimes. The bipolar patches can be interpreted as being produced by sea-serpent field lines that originate in the mid-penumbra and eventually leave the spot in the form moving magnetic features. The existence of such field lines has been inferred from Stokes inversions of spectropolarimetric measurements at lower angular resolution, but this is the first time they are imaged directly. Our observations add another piece of evidence in favor of the uncombed structure of penumbral magnetic fields.

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