Climatology of TEC Longitudinal Difference in Middle Latitudes of East Asia

In this paper, a statistical analysis of the diurnal, seasonal and solar cycle variation in TEC longitudinal difference midlatitudes East Asia is presented using CODE GIMs data 2015–2019. Moreover, empirical neutral wind model HWM-14 geomagnetic field IGRF-2020 were employed to analyze influence configuration-neutral mechanism on difference, F2 layer peak electron density (NmF2) from Constellation Observing System for Meteorology, Ionosphere Climate (COSMIC) also used study role local difference. For high activity year, results show that east-west index Re/w negative noon positive at evening-night. daytime most evident summer, less autumn least spring winter, while nighttime obvious equinox, followed by summer winter during nighttime. The simulation shows longitude around mainly caused zonal wind-declination mechanism, 4-h time delay seems be an optimal result vertical drift velocity cause pre-noon hours. At night, uplifting flux, which product velocity, good correlation with Re/w, indicating important factor affecting there was about 3-h between variations flux night. low years, western greater than eastern year except diurnal east west suggested should related other physical process, such as midlatitude anomaly (MSNA) ionospheric enhancement (INE). current provides evidence NmF2 Asian proposed previous studies finds some new features need further studying improve our understanding years. provide insight into midlatitudes, they can contribute ionosphere-thermosphere coupling system.