arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1102.1034astro-ph.SR
收藏

用NST和Hinode仪器观测的小尺度通量出现的色球特征

Chromospheric signatures of small-scale flux emergence as observed with NST and Hinode instruments

V. B. Yurchyshyn, P. R. Goode, V. I. Abramenko, J. Chae, W. Cao, A. Andic, K. Ahn

摘要:

随着越来越多的高分辨率图像的太阳表面在众多的波长,在小的空间尺度上发生的各种过程已经成为我们关注的焦点。据报道,复杂的小尺度磁场似乎有足够的储存来加热色球层。虽然在了解小规模现象方面取得了重大进展,但许多具体情况仍然难以捉摸。我们在这里提出了一个详细的研究,一个单一的事件消失的磁偶极子和相关的色球活动。根据新太阳望远镜H $α$资料和{ \it Hinode}光球视线磁象图及Ca II H图象,我们报告如下结果。1)我们的分析表明,即使是非常小的偶极子(元素分离约0 \arcsec .5或更少)可能会达到色球层,并触发不可忽略的色球活动。2)仔细考虑新通量沉积的磁环境可能会揭示太阳表面磁通量去除的细节。我们认为,两个相反极性元素的明显碰撞和消失可能不一定表明它们的取消(即,重新连接、“U”形管出现或$ Ω$环浸没)。在我们的例子中,磁偶极子通过与上覆的大规模倾斜斑场重新连接而消失。3)在带外H $α$图像中看到的亮点与Ca II H亮点非常相关,而Ca II H亮点又与G带亮点共空间。我们进一步推测,在一般情况下,H $α$亮点预计与光球BPs共空间,然而,需要直接比较来完善它们的关系。

英文摘要:

With the ever increasing influx of high resolution images of the solar surface obtained at a multitude of wavelengths, various processes occurring at small spatial scales have become a greater focus of our attention. Complex small-scale magnetic fields have been reported that appear to have enough stored to heat the chromosphere. While significant progress has been made in understanding small-scale phenomena, many specifics remain elusive. We present here a detailed study of a single event of disappearance of a magnetic dipole and associated chromospheric activity. Based on New Solar Telescope H$α$ data and {\it Hinode} photospheric line-of-sight magnetograms and Ca II H images we report the following. 1) Our analysis indicates that even very small dipoles (elements separated by about 0\arcsec.5 or less) may reach the chromosphere and trigger non-negligible chromospheric activity. 2) Careful consideration of the magnetic environment where the new flux is deposited may shed light on the details of magnetic flux removal from the solar surface. We argue that the apparent collision and disappearance of two opposite polarity elements may not necessarily indicate their cancellation (i.e., reconnection, emergence of a "U" tube or submergence of $ Ω$ loops). In our case, the magnetic dipole disappeared by reconnecting with overlying large-scale inclined plage fields. 3) Bright points seen in off-band H$α$ images are very well-correlated with the Ca II H bright points, which in turn are co-spatial with G-band bright points. We further speculate that, in general, H$α$ bright points are expected be co-spatial with photospheric BPs, however, a direct comparison is needed to refine their relationship.

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。

↑