COMPARATIVE ANALYSIS OF VARIABILITY IN THE MID-LATITUDE STRATOSPHERE AND IONOSPHERE IN WINTER PERIODS

In this work, we perform a joint analysis of the spatial-temporal dynamics of ionospheric and stratospheric variability (with scales characteristic of internal gravity waves) at different longitudes of midlat-itudes of the Northern Hemisphere. We analyze the win-ter periods of 2012-2013 and 2018-2019 when strong midwinter sudden stratospheric warmings (SSWs) oc-curred. An increase in the variability in the stratosphere is shown to occur in a limited latitude interval 40-60 & DEG; N in the region of existence of a winter circumpolar vor-tex. Under SSW conditions, the generation of wave dis-turbances in the stratosphere ceases manifesting itself in a significant decrease in the stratospheric variability index. Similar behavior is noted in the spatial-temporal dynamics of the index of the total electron content variability. The level of ionospheric variability at midlati-tudes decreases significantly after SSW peaks. The de-crease in the ionospheric variability can be explained by a reduction in wave generation in the stratosphere, asso-ciated with the destruction of the circumpolar vortex during SSWs.