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arXiv 1302.4893astro-ph.SR
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大太阳孔上方的大气层

Atmosphere above a large solar pore

M. Sobotka, M. Svanda, J. Jurcak, P. Heinzel, D. Del Moro

摘要:

2008年10月15日,邓恩太阳望远镜的IBIS光谱仪观测到一个带有颗粒状光桥的大太阳孔,并获得了69分钟长的光谱扫描,其中Ca II 854.2 nm和Fe I 617.3 nm。Ca II线的强度和多普勒信号分离。这条线采样了核心的中间色球层和机翼的中间光球层。虽然没有迹象表明的半影被认为是在光球,一个扩展的附属结构,无论是在强度和多普勒信号,观察到的钙II线核心。形态学和动力学特性的结构分析表明,一个太阳黑子的半影与发达的半影非常相似。特别注意的是光桥,这是最明亮的功能,在孔隙中看到的钙II线中心,并显示了增强的色球振荡功率在3-5兆赫。虽然光桥中的声功率通量是“安静”色球层中的五倍,但它不能解释观测到的亮度。

英文摘要:

A large solar pore with a granular light bridge was observed on October 15, 2008 with the IBIS spectrometer at the Dunn Solar Telescope and a 69-min long time series of spectral scans in the lines Ca II 854.2 nm and Fe I 617.3 nm was obtained. The intensity and Doppler signals in the Ca II line were separated. This line samples the middle chromosphere in the core and the middle photosphere in the wings. Although no indication of a penumbra is seen in the photosphere, an extended filamentary structure, both in intensity and Doppler signals, is observed in the Ca II line core. An analysis of morphological and dynamical properties of the structure shows a close similarity to a superpenumbra of a sunspot with developed penumbra. A special attention is paid to the light bridge, which is the brightest feature in the pore seen in the Ca II line centre and shows an enhanced power of chromospheric oscillations at 3-5 mHz. Although the acoustic power flux in the light bridge is five times higher than in the "quiet" chromosphere, it cannot explain the observed brightness.

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