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arXiv 1304.0752astro-ph.SRastro-ph.IM
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太阳黑子色球的暗闪物理性质

Physical Properties of a Sunspot Chromosphere with Umbral Flashes

J. de la Cruz Rodríguez, L. Rouppe van der Voort, H. Socas-Navarro, M. van Noort

摘要:

我们提出了对太阳黑子本影闪光的新的高分辨率分光偏振Ca II 8542观测结果。在近0.18”,并跨越约一个小时的连续观察,这是迄今为止公布的最详细的数据集。我们的研究涉及LTE和非LTE反演(但也包括弱场分析作为健全性检查),以量化温度,质量流量和完整的磁场矢量几何形状。我们证实了早先的报道,超高频有非常精细的结构,热和冷的材料在亚弧秒尺度上混合。冲击波阵面比周围的物质热大约1000 K。我们没有观察到本影中的场的显著波动。然而,在半影中,运行的半影波的通过使磁场强度改变约200 G(峰-峰幅度),但它不改变场的方向(至少在我们几度的灵敏度内不显著)。我们发现对于视线速度和磁场强度,随着磁场倾斜度的增加,高频调制功率有减小的趋势。在外部半影中,我们发现没有高频功率,而朝向本影的高频功率越来越多。

英文摘要:

We present new high-resolution spectro-polarimetric Ca II 8542 observations of umbral flashes in sunspots. At nearly 0.18", and spanning about one hour of continuous observation, this is the most detailed dataset published thus far. Our study involves both LTE and non-LTE inversions (but includes also a weak field analysis as a sanity check) to quantify temperatures, mass flows and the full magnetic field vector geometry. We confirm earlier reports that UFs have very fine structure with hot and cool material intermixed at sub-arcsecond scales. The shock front is roughly 1000 K hotter than the surrounding material. We do not observe significant fluctuations of the field in the umbra. In the penumbra, however, the passage of the running penumbral waves alter the magnetic field strength by some 200 G (peak-to-peak amplitude) but it does not change the field orientation (at least not significantly within our sensitivity of a few degrees). We find a trend of decreasing high-frequency modulation power for more inclined magnetic fields for the line-of-sight velocity and magnetic field strength. In the outer penumbra we find an absence of high frequency power while there is increasingly more power at high frequencies towards the umbra.

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