A Method of Extracting Flat Field from Real Time Solar Observation Data

doi:10.1007/s11207-025-02435-x

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	A Method of Extracting Flat Field from Real Time Solar Observation Data
	Jin YH(金亚辉)1,2 ; Liu H(刘辉)1 ; Ji KF(季凯帆)1 ; Jin ZY(金振宇)1 ; Meng WJ(孟伟杰)1,2
发表期刊	SOLAR PHYSICS
	2025-02
卷号	300 期号:2
DOI	10.1007/s11207-025-02435-x
产权排序	第1完成单位
收录类别	SCI
关键词	Flat field Data processing Chromosphere data Photosphere data
摘要	Existing methods for obtaining a flat field rely on observed data collected under specific observation conditions to determine the flat field. However, the telescope pointing and the column-fixed pattern noise of the CMOS detector change during actual observations. This leads to the residual signals in real-time observation data after flat field correction, such as interference fringes and column-fixed pattern noise. In actual observations the wind causes the telescope to wobble slightly, which leads to shifts in the observed data. In this paper, we propose a method of extracting the flat field from the real-time solar observation data. Firstly, the average flat field obtained by multiframe averaging is used as the initial value. A set of real-time observation data is input into the KLL method to calculate the correction amount for the average flat field. Secondly, the average flat field is corrected using the calculated correction amount to obtain the real flat field for the current observation conditions. To overcome the residual solar structures caused by atmospheric turbulence in the correction amount, real-time observation data are grouped to calculate the correction amounts. These residual solar structures are suppressed by averaging multiple groups, improving the accuracy of the correction amount. The test results from diffraction-limited and ground-based simulated data demonstrate that our method can effectively calculate the correction amount for the average flat field. The New Vacuum Solar Telescope (NVST) He I 10830 & Aring;/H alpha\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\alpha $\end{document} data were also tested. High-resolution reconstruction confirms that the correction amount effectively corrects the average flat field to obtain the real flat field for the current observation conditions. Our method works for chromosphere and photosphere data.
资助项目	Yunnan Key Laboratory of Solar Physics and Space Science[202205AG070009]; Yunnan Revitalization Talent Support Program[202305AT350005]; Yunnan Revitalization Talent Support Program[202305AS350029]
项目资助者	Yunnan Key Laboratory of Solar Physics and Space Science[202205AG070009] ; Yunnan Revitalization Talent Support Program[202305AT350005, 202305AS350029]
语种	英语
学科领域	天文学 ; 太阳与太阳系
文章类型	Article
出版者	SPRINGER
出版地	VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN	0038-0938
URL	查看原文
WOS记录号	WOS:001417583200001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	TELESCOPE
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/28161
专题	天文技术实验室
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China; 2.University of Chinese Academy of Sciences, Beijing, 100049, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Jin YH,Liu H,Ji KF,et al. A Method of Extracting Flat Field from Real Time Solar Observation Data[J]. SOLAR PHYSICS,2025,300(2).
APA	金亚辉,刘辉,季凯帆,金振宇,&孟伟杰.(2025).A Method of Extracting Flat Field from Real Time Solar Observation Data.SOLAR PHYSICS,300(2).
MLA	金亚辉,et al."A Method of Extracting Flat Field from Real Time Solar Observation Data".SOLAR PHYSICS 300.2(2025).

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