Irregular Spatial Distributions of Spectral Line Parameters in the Middle Solar Chromosphere Revealed from Analysis of Solar Flash MgⅠb_(2)Spectra

作     者：Yuhang Jin Zhongquan Qu Zhi Xu Guangtao Dun Liang Chang Xiangming Cheng Xiaoyu Zhang Linhua Deng Yang Peng Yuhang Jin;Zhongquan Qu;Zhi Xu;Guangtao Dun;Liang Chang;Xiangming Cheng;Xiaoyu Zhang;Linhua Deng;Yang Peng

作者机构：School of Astronomy and Space ScienceUniversity of Chinese Academy SciencesBeijing 100049China Yunnan ObservatoriesChinese Academy of SciencesKunming 650216China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2022年第22卷第8期

页      面：111-124页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：the National Natural Science Foundation of China(NSFC Grant Nos.11527804 U1931206 11373065 11078005 10943002 and 12003066) 

主　　题：Sun:atmosphere Sun:chromosphere Sun:fundamental parameters 

摘      要：This paper presents the analytical results of solar MgⅠb_(2)flash spectra,obtained by the prototype Fiber Arrayed Solar Optic Telescope in process of the 2013 Gabon total solar *** analysis reveals irregular distributions of the spectral line parameters like ratio of line source function to continuum oneβ,ratio of line emissivity to continuum emissivityζ,ratio of the continuum opacity to the line opacity r_(0),line center optical depthτ_(0)、,the line widthΔλ_(D),and the line-of-sight velocity v_(los),while the approximately spherical symmetry can be found in the maps of integrated line intensity and continuum *** irregular distributions originate from those of line profile features like the maximum intensity,the line width and line center *** is also found from the recovered line center optical depthτ_(0) that in the middle chromosphere,the optical depth is not small due to nonignorable absorption and the long light path along the ***,we show that the excessive broadening of spectral lines can be due to co-existence of multiple radiative sources with different line-of-sight velocities unresolved in one detector pixel.