Extreme ultraviolet(EUV)observations are widely used in solar activity research and space weather forecasting since they can observe both the solar eruptions and the source regions of the solar wind.Flat field processing is indispensable to remove the instrumental non-uniformity of a solar EUV imager in producing high-quality scientific data from original observed data.FengYun-3E(FY-3E)is a meteorological satellite operated in a Sun-synchronous orbit,and the routine EUV imaging data from the Solar X-ray and Extreme Ultraviolet Imager(X-EUVI)onboard FY-3E has the characteristic of concentric rotation.Taking advantage of the concentric rotation,we propose a post-hoc flat field measurement method for its EUV 195 ? channel in this paper.This method removes the small-scale and time-varying component of coronal activities by taking the median value for each pixel along the time axis of a concentric rotation data cube,and then derives the large-scale and invariable component of the quiet coronal radiation,and finally generates a flat field image.The flat field can be generated with cadences from hundreds of minutes(one orbit)to several days.Higher flat field accuracy can be achieved by employing more data.Further analysis shows that our method is able to measure the instrumental spot-like non-uniformity possibly caused by contamination on the detector,which mostly disappears after the in-orbit self-cleaning process.It can also measure the quasi-periodic grid-like non-uniformity,possibly from the obscuration of the support mesh on the rear filter.After flat field correction,these instrumental non-uniformities from the original data are effectively removed.Moreover,the X-EUVI 195 ? data after dark and flat field corrections are consistent with the 193 ? imaging data from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory,verifying the suitability of the method.The post-hoc method does not occupy observation time,which is advantageous for space weather operations.Our method is not only suitable for FY-3E/X-EUVI but also a candidate method for the flat field measurement of future solar EUV telescopes.

Qiao Song;Xianyong Bai;Bo Chen;Xiuqing Hu;Yajie Chen;Zhenyong Hou;Xiaofan Zhang;Lingping He;Kefei Song;Peng Zhang;Jing-Song Wang;Xiaoxin Zhang;Weiguo Zong;Jinping Dun;Hui Tian;Yuanyong Deng

Key Laboratory of Space Weather,National Satellite Meteorological Center(National Center for Space Weather),China Meteorological Administration,Beijing 100081,China;State Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190,China;Innovation Center for Fengyun Meteorological Satellite,China Meteorological Administration,Beijing 100081,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,National Satellite Meteorological Center(National Center for Space Weather),China Meteorological Administration,Beijing 100081,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China

天文和天体物理学研究

[1]Qiao Song;Xianyong Bai;Bo Chen;Xiuqing Hu;Yajie Chen;Zhenyong Hou;Xiaofan Zhang;Lingping He;Kefei Song;Peng Zhang;Jing-Song Wang;Xiaoxin Zhang;Weiguo Zong;Jinping Dun;Hui Tian;Yuanyong Deng-.A New Post-hoc Flat Field Measurement Method for the Solar X-Ray and Extreme Ultraviolet Imager Onboard the FengYun-3E Satellite)[J].天文和天体物理学研究,2022(10):1-10

Onboard,FengYun,EUVI,cadences,obscuration

New,Post,hoc,Flat,Field,Measurement,Method,Solar,Ray,Extreme,Ultraviolet,Imager,3E,Satellite,ultraviolet,observations,are,widely,solar,activity,research,space,weather,forecasting,since,they,both,eruptions,source,regions,wind,field,processing,indispensable,instrumental,uniformity,imager,producing,high,quality,scientific,data,from,original,observed,FY,meteorological,satellite,operated,Sun,synchronous,orbit,routine,imaging,ray,onboard,has,characteristic,concentric,rotation,Taking,propose,post,flat,measurement,method,its,channel,this,paper,This,removes,small,scale,varying,component,coronal,activities,by,taking,median,value,each,pixel,along,axis,cube,then,derives,large,invariable,quiet,radiation,finally,generates,generated,hundreds,minutes,several,days,Higher,accuracy,achieved,employing,more,Further,analysis,shows,that,spot,like,possibly,caused,contamination,detector,which,mostly,disappears,after,self,cleaning,It,also,quasi,periodic,grid,support,mesh,rear,filter,After,these,uniformities,effectively,removed,Moreover,dark,corrections,consistent,Atmospheric,Imaging,Assembly,Dynamics,Observatory,verifying,suitability,does,not,occupy,advantageous,operations,Our,only,suitable,but,candidate,future,telescopes

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