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

Earth and Planetary Physics 2023年第5期7卷 565-575页

作者： XiaoYu Wang Xing Cao Xin Ma XiaoXin Zhang AnQin Chen JunHu Dong BinBin Ni XianKang Dou Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China Key Laboratory of Space Weather National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijing 100081China Innovation Center for fengyun Meteorological Satellite(FYSIC) National Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081China

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.

关键词： cross-satellite calibration high-energy electron flux fengyun-4a Arase

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fengyun-4 Geostationary Satellite-Based Solar Energy Nowcasting System and Its Application in North China

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Advances in Atmospheric Sciences 2022年第8期39卷 1316-1328页

作者： Chunlin HUANG Hongrong SHI Ling GAO Mengqi LIU Qixiang CHEN Disong FU Shu WANG Yuan YUAN Xiang′ao XIA Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China National Satellite Meteorological Center China Meteorological AdministrationBeijing 100192China Key Laboratory of Atmospheric Sounding Chengdu University of Information TechnologyChengdu 610225China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research Institute(CEPRI)Beijing 100192China Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Surface solar irradiance(SSI)nowcasting(0-3 h)is an effective way to overcome the intermittency of solar energy and to ensure the safe operation of grid-connected solar power plants.In this study,an SSI estimate and nowcasting system was established using the near-infrared channel of fengyun-4a(FY-4a)geostationary satellite.The system is composed of two key components:The first is a hybrid SSI estimation method combining a physical clear-sky model and an empirical cloudy-sky model.The second component is the SSI nowcasting model,the core of which is the derivation of the cloud motion vector(CMV)using the block-matching method.The goal of simultaneous estimation and nowcasting of global horizontal irradiance(GHI)and direct normal irradiance(DNI)is fulfilled.The system was evaluated under different sky conditions using SSI measurements at Xianghe,a radiation station in the North China Plain.The results show that the accuracy of GHI estimation is higher than that of DNI estimation,with a normalized root-mean-square error(nRMSE)of 22.4%relative to 45.4%.The nRMSE of forecasting GHI and DNI at 30-180 min ahead varied within 25.1%-30.8%and 48.1%-53.4%,respectively.The discrepancy of SSI estimation depends on cloud occurrence frequency and shows a seasonal pattern,being lower in spring-summer and higher in autumn-winter.The FY-4a has great potential in supporting SSI nowcasting,which promotes the development of photovoltaic energy and the reduction of carbon emissions in China.The system can be improved further if calibration of the empirical method is improved.

关键词： fengyun-4a surface solar irradiance estimates and forecasting cloud motion block-matching

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