Assessment of International GNSS Service Global Ionosphere Map products over China region based on measurements from the Crustal Movement Observation Network of ChinaOAEI
The global ionosphere maps(GIM)provided by the International GNSS Service(IGS)are extensively utilized for ionospheric morphology monitoring,scientific research,and practical application.Assessing the credibility of GIM products in data-sparse regions is of paramount importance.In this study,measurements from the Crustal Movement Observation Network of China(CMONOC)are leveraged to evaluate the suitability of IGS-GIM products over China region in 2013-2014.The indices of mean error(ME),root mean square error(RMSE),and normalized RMSE(NRMSE)are then utilized to quantify the accuracy of IGS-GIM products.Results revealed distinct local time and latitudinal dependencies in IGS-GIM errors,with substantially high errors at nighttime(NRMSE:39%)and above 40°latitude(NRMSE:49%).Seasonal differences also emerged,with larger equinoctial deviations(NRMSE:33.5%)compared with summer(20%).A preliminary analysis implied that the irregular assimilation of sparse IGS observations,compounded by China’s distinct geomagnetic topology,may manifest as error variations.These results suggest that modeling based solely on IGS-GIM observations engenders inadequate representations across China and that a thorough examination would proffer the necessary foundation for advancing regional total electron content(TEC)constructions.
Jin Hu;HaiBing Ruan;FuQing Huang;ShengYang Gu;XianKang Dou;
Institute of Space Weather,Nanjing University of Information Science and Technology,Nanjing 210044,China State Key Laboratory of Space Weather,Chinese Academy of Sciences(CAS),Beijing 100190,China School of Electronic Information,Wuhan University,Wuhan 430072,ChinaInstitute of Space Weather,Nanjing University of Information Science and Technology,Nanjing 210044,China State Key Laboratory of Space Weather,Chinese Academy of Sciences(CAS),Beijing 100190,China Wuxi Research Institute,Nanjing University of Information Science and Technology,Wuxi Jiangsu 214000,ChinaCAS Key Laboratory of Geospace Environment,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,ChinaSchool of Electronic Information,Wuhan University,Wuhan 430072,China
测绘与仪器
International GNSS Service(IGS)Global Ionosphere Maps(GIM)Crustal Movement Observation Network of China(CMONOC)total electron content(TEC)data assessment
《Earth and Planetary Physics》 2024 (002)
P.400-407 / 8
the National Key R&D Program of China(Grant No.2022YFF0503702);the National Natural Science Foundation of China(Grant Nos.42074186,41831071,42004136,and 42274195);the Natural Science Foundation of Jiangsu Province(Grant No.BK20211036);the Specialized Research Fund for State Key Laboratories,and the University of Science and Technology of China Research Funds of the Double First-Class Initiative(Grant No.YD2080002013).
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