Cross-satellite calibration of high-energy electron fluxes measured by FengYun-4A based on Arase observations

• Published in: Earth and planetary physics 2023-09, Vol.7 (5), p.565-575
• Main Authors: Wang, XiaoYu, Cao, Xing, Ma, Xin, Zhang, XiaoXin, Chen, AnQin, Dong, JunHu, Ni, BinBin, Dou, XianKang
• Format: Article
• Language: English
• Subjects: arase; cross-satellite calibration; fengyun-4a; high-energy electron flux
• ISSN: 2096-3955; 2096-3955
• DOI: 10.26464/epp2023076

We use the High-energy Electron Experiments(HEP)instrument onboard Arase(ERG)to conduct an energy-dependent cross-satellite calibration of electron fluxes measured by the High Energy Particle Detector(HEPD)onboard FengYun-4A(FY-4A)spanning from April 1,2017,to September 30,2019.By tracing the two-dimensional magnetic positions(L,magnetic local time[MLT])of FY-4A at each time,we compare the datasets of the conjugate electron fluxes over the range of 245-894 keV in 6 energy channels for the satellite pair within different sets of L×MLT.The variations in the electron fluxes observed by FY-4A generally agree with the Arase measurements,and the percentages of the ratios of electron flux conjunctions within a factor of 2 are larger than 50%.Compared with Arase,FY-4A systematically overestimates electron fluxes at all 6 energy channels,with the corresponding calibration factors ranging from 0.67 to 0.81.After the cross-satellite calibration,the electron flux conjunctions between FY-4A and Arase show better agreement,with much smaller normalized root mean square errors.Our results provide a valuable reference for the application of FY-4A high-energy electron datasets to in-depth investigations of the Earth's radiation belt electron dynamics.