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Statistical analysis of the SiI 6560.58 Å line observed by CHASE
Hong, Jie1,2; Qiu, Ye1,2; Hao, Qi1,2; Xu Z(徐稚)3; Li, Chuan1,2; Ding, Mingde1,2; Fang, Cheng1,2
发表期刊Astronomy and Astrophysics
2022-12-01
卷号668
DOI10.1051/0004-6361/202244427
产权排序第3完成单位
收录类别SCI ; EI
关键词line: formation line: profiles Sun: photosphere turbulence
摘要

Context. The Sia I 6560.58 Å line in the Hα blue wing is blended with a telluric absorption line from water vapor in ground-based observations. Recent observations with the space-based telescope, the Chinese Hα Solar Explorer (CHASE), provide a new opportunity to study this line. Aims. We aim to study the Sia I line statistically and to explore possible diagnostics. Methods. We selected three scannings in the CHASE observations, and measured the equivalent width (EW) and the full width at half maximum (FWHM) for each pixel on the solar disk. We then calculated the theoretical EW and FWHM from the VALC model. We also studied an active region in particular in order to identify possible differences in the quiet Sun and the sunspots. Results. The Sia I line is formed at the bottom of the photosphere. The EW of this line increases from the disk center to μ = 0.2, and then decreases toward the solar limb, while the FWHM shows a monotonically increasing trend. Theoretically predicted EW agrees well with observations, while the predicted FWHM is far smaller due to the absence of unresolved turbulence in models. The macroturbulent velocity is estimated to be 2.80 km s 1 at the disk center, and increases to 3.52 km s 1 at μ = 0.2. We do not find any response to flare heating in the observations studied here. Doppler shifts and line widths of the Sia I 6560.58 Å and Fea I 6569.21 Å lines can be used to study the mass flows and turbulence of the different photospheric layers. The Sia I line shows significant potential as a tool to diagnose the dynamics and energy transport in the photosphere. © J. Hong et al. 2022.

资助项目N/A
项目资助者N/A
语种英语
学科领域天文学 ; 太阳与太阳系 ; 太阳物理学
学科门类理学 ; 理学::天文学
文章类型Journal article (JA)
出版者EDP Sciences
ISSN0004-6361
URL查看原文
EI入藏号20230113333357
EI主题词Turbulence
EI分类号802.3 Chemical Operations
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/25718
专题光纤阵列太阳光学望远镜研究组
作者单位1.School of Astronomy and Space Science, Nanjing University, Nanjing, 210023, China;
2.Key Laboratory for Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, 210023, China;
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China
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GB/T 7714
Hong, Jie,Qiu, Ye,Hao, Qi,et al. Statistical analysis of the SiI 6560.58 Å line observed by CHASE[J]. Astronomy and Astrophysics,2022,668.
APA Hong, Jie.,Qiu, Ye.,Hao, Qi.,Xu Z.,Li, Chuan.,...&Fang, Cheng.(2022).Statistical analysis of the SiI 6560.58 Å line observed by CHASE.Astronomy and Astrophysics,668.
MLA Hong, Jie,et al."Statistical analysis of the SiI 6560.58 Å line observed by CHASE".Astronomy and Astrophysics 668(2022).
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