supported by the National Key R&D Program of China(2022YFF0504400);the National Natural Science Foundation of China(42188101,42274195,42174193);the International Partnership Program Of Chinese Academy of Sciences(Grant No.183311KYSB20200003);the USTC Research Funds of the Double First-Class Initiative(YD2080002013);the Joint Open Fund of Mengcheng National Geophysical Observatory(MENGO-202408).
Statistical characteristics and the classification of the topside ionospheric mid-latitude trough are systemically analyzed,using observations from the Defense Meteorological Satellite Program F18(DMSP-F18)satellite.T...