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arXiv 1302.2772astro-ph.SR
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太阳黑子本影上方大气中的精细结构

Fine structures in the atmosphere above a sunspot umbra

L. Bharti, J. Hirzberger, S. K. Solanki

摘要:

我们提出了同步光球和色球观测的拖尾太阳黑子在NOAA 10904,获得与瑞典太阳望远镜(SST)的拉帕尔马,加那利群岛。时间序列的高分辨率\ion{Ca}{ii} \、$H$图像显示,太阳黑子本影中的瞬变喷流状结构被拉长,我们称之为本影微喷流。这些射流大致平行于附近的半影微射流,表明它们与背景磁场对齐。一般来说,首先会出现一个明亮的点状结构,之后会出现喷流,尽管有些喷流出现时没有相关的色球点。明亮的光球本影点与产生于外影的本影微喷流有关。然而,在类似喷流的事件和潜在的本影点之间没有一对一的对应关系。它们的长度通常小于1 \arcsec,宽度小于0 \farcs 3。本影微射流的典型寿命约为一分钟。这些结构的亮度随着局部背景的亮度从本影中心向本影-半影边界增加。

英文摘要:

We present simultaneous photospheric and chromospheric observations of the trailing sunspot in NOAA 10904, obtained with the Swedish Solar Telescope (SST) La Palma, Canary Islands. Time series of high resolution \ion{Ca}{ii}\,$H$ images show transient jet-like structures in sunspot umbrae are elongated, which we call umbral microjets. These jets are directed roughly parallel to nearby penumbral microjets, suggesting that they are aligned with the background magnetic field. In general, first a bright dot-like structure appears, from which a jet later emerges, although some jets appear without an associated chromospheric dot. Bright photospheric umbral dots are associated with umbral microjets arising in the outer umbra. Nevertheless, a one-to-one correspondence between jet-like events and underlying umbral dots is not seen. They are typically less than 1\arcsec ~long and less than 0\farcs3 wide. The typical lifetime of umbral microjets is around one minute. The brightness of these structures increases from the center of the umbra towards the umbra-penumbra boundary along with the brightness of the local background.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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