THERMOSPHERIC WIND VARIABILITY AND ITS IMPACT ON IONOSPHERIC PLASMA MOTION

Abstract

The thermospheric wind system plays a pivotal role in shaping the dynamics of ionospheric plasma, particularly in low and mid-latitudes. This study investigates the temporal and spatial variability of thermospheric winds using observational and model-based data, and quantifies their impact on ionospheric plasma motion, focusing on vertical drift and equatorial anomaly behavior. Utilizing data from Fabry–Perot interferometers (FPIs), satellite observations (ICON and CHAMP), and ionosonde stations across South Asia, the study reveals significant seasonal and diurnal variations in zonal and meridional wind components. Coupled effects with geomagnetic and solar drivers are also discussed. The results highlight the sensitivity of ionospheric plasma motion to wind shears, indicating implications for space weather forecasting and GNSS signal integrity.