Automatic detection and correction algorithms for magnetic saturation in the SMFT/HSOS longitudinal magnetograms

作     者：徐海清 刘锁 苏江涛 邓元勇 Andrei Plotnikov 白先勇 陈洁 杨潇 郭晶晶 王晓帆 宋永亮 Hai-Qing Xu;Suo Liu;Jiang-Tao Su;Yuan-Yong Deng;Andrei Plotnikov;Xian-Yong Bai;Jie Chen;Xiao Yang;Jing-Jing Guo;Xiao-Fan Wang;Yong-Liang Song

作者机构：Key Laboratory of Solar ActivityNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Crimean Astrophysical ObservatoryRussian Academy of SciencesNauchnyCrimea298409Russi 

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

年 卷 期：2021年第21卷第3期

页      面：158-166页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11703042,11911530089,U1731241,11773038,11427901,11427803,11673033,U1831107,11873062) the Strategic Priority Research Program on Space Science Chinese Academy of Sciences(Grant Nos.XDA15320302,XDA15052200,XDA15320102) the13th Five-year Informatization Plan of Chinese Academy of Sciences(Grant No.XXH13505–04) 

主　　题：Sun:sunspots Sun:magnetic field Methods:data analysis 

摘      要：A longitudinal magnetic field often suffers the saturation effect in a strong magnetic field region when the measurement is performed at a single-wavelength point and linear calibration is *** this study,we develop a method that can judge the threshold of saturation in Stokes V/I observed by the Solar Magnetic Field Telescope(SMFT)and correct it *** procedure is to first perform the second-order polynomial fit to the Stokes V/I vs.I/I_(m)(I_(m) is the maximum value of Stokes I)curve to estimate the threshold of saturation,then reconstruct Stokes V/I in a strong field region to correct for *** algorithm is demonstrated to be effective by comparing with the magnetograms obtained by the Helioseismic and Magnetic Imager(HMI).The accuracy rate of detection and correction for saturation is~99.4%and~88%respectively among 175 active *** advantages and disadvantages of the algorithm are discussed.