Morphological study of penumbral formation
Morphological study of penumbral formation
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DOI：
10.1093/pasj/psu084
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
R. Kitai;H. Watanabe;Ken Otsuji
中科院分区：
文献类型：
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作者：
R. Kitai;H. Watanabe;Ken Otsuji
半影被认为是在相对较大和成熟的太阳黑子的本影周围主要是水平磁场的区域。在本文中，我们对NOAA10978的半影形成进行了观测研究，在SOT/Hinode的g波段图像中观测到几个半影形成。由于Hinode的持续观测，我们可以从形态学上跟踪太阳黑子的演变，并发现半影形成有几种途径：(1)磁通量的主动积累，(2)磁场的快速出现，(3)扭曲或旋转磁管的出现。在所有这些情况下，预计磁场在磁通管集中边缘维持高倾角的时间将长于向下磁泵的特征生长时间。
Penumbrae are known to be area of mainly horizontal magnetic field surrounding umbrae of relatively large and mature sunspots. In this paper, we observationally studied the formation of penumbrae in NOAA10978, where several penumbral formations were observed in G-band images of SOT/Hinode. Thanks to the continuous observation by Hinode, we could morphologically follow the evolution of sunspots and found that there are several paths to the penumbral formation: (1) Active accumulation of magnetic flux, (2) Rapid emergence of magnetic field, and (3) Appearance of twisted or rotating magnetic tubes. In all of these cases, magnetic fields are expected to sustain high inclination at the edges of flux tube concentration longer than the characteristic growth time of downward magnetic pumping.