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arXiv 0709.0569astro-ph
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太阳黑子G波段和Ca II H谱线振荡的日珥光学望远镜观测

Observations of Sunspot Oscillations in G band and Ca II H line with Solar Optical Telescope on Hinode

Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Hiromoto Shibahashi, Saku Tsuneta, Kiyoshi Ichimoto, Yukio Katsukawa, Bruce W. Lites, Shin'ichi Nagata,… 展开作者

Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Hiromoto Shibahashi, Saku Tsuneta, Kiyoshi Ichimoto, Yukio Katsukawa, Bruce W. Lites, Shin'ichi Nagata, Toshifumi Shimizu, Richard A. Shine, Yoshinori Suematsu, Theodore D. Tarbell, Alan M. Title

摘要:

利用Hinode太阳光学望远镜的高分辨率观测资料,研究了NOAA活动区10935及其附近振荡信号功率谱密度的空间分布。G波段的数据表明,在本影的振荡功率被抑制在所有的频率范围内。另一方面,在Ca II H强度图中,可以清楚地看到本影中的振荡,即所谓的本影闪光,其功率峰值约为5.5 mHz。Ca II H的功率分布显示了增强的元素与空间尺度的本影闪光的大部分本影,但有一个区域与抑制的功率在本影的中心。这种节点状特征的起源和性质仍然无法解释。

英文摘要:

Exploiting high-resolution observations made by the Solar Optical Telescope onboard Hinode, we investigate the spatial distribution of power spectral density of oscillatory signal in and around NOAA active region 10935. The G-band data show that in the umbra the oscillatory power is suppressed in all frequency ranges. On the other hand, in Ca II H intensity maps oscillations in the umbra, so-called umbral flashes, are clearly seen with the power peaking around 5.5 mHz. The Ca II H power distribution shows the enhanced elements with the spatial scale of the umbral flashes over most of the umbra but there is a region with suppressed power at the center of the umbra. The origin and property of this node-like feature remain unexplained.

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