Statistical analysis of the SiI 6560.58 Å line observed by CHASE
文献类型:期刊论文
作者 | Hong, Jie1,2; Qiu, Ye1,2; Hao, Qi1,2; Xu Z(徐稚)3; Li, Chuan1,2; Ding, Mingde1,2; Fang, Cheng1,2 |
刊名 | Astronomy and Astrophysics |
出版日期 | 2022-12-01 |
卷号 | 668 |
ISSN号 | 0004-6361 |
关键词 | line: formation line: profiles Sun: photosphere turbulence |
DOI | 10.1051/0004-6361/202244427 |
产权排序 | 第3完成单位 |
文献子类 | Journal article (JA) |
英文摘要 | 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. |
学科主题 | 天文学 ; 太阳与太阳系 ; 太阳物理学 |
URL标识 | 查看原文 |
资助项目 | N/A |
语种 | 英语 |
出版者 | EDP Sciences |
资助机构 | N/A |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25718] |
专题 | 云南天文台_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 |
推荐引用方式 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). |
入库方式: OAI收割
来源:云南天文台
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