BOOK OF ABSTRACTS AND CONTRIBUTED PAPERS: International scientific conference Meeting on Operational and Research Capabilities for Better Understanding Solar-Terrestrial Interactions,
Pages: 30-31,
https://doi.org/10.69646/aob250907
International scientific conference Meeting on Operational and Research Capabilities for Better Understanding Solar-Terrestrial Interactions
Published by: Scientific Society Isaac Newton

This study investigates the impact of minor geomagnetic storm of 03–04 February 2022 and super geomagnetic storm of 11 May 2024 on the variations of ionospheric responses across the low, mid, and high-latitudes while assessing potential connection of failu re of Starlink satellites from variations of solar wind parameters (Bz, density, speed and plasma beta) perspective. The analysis utilizes Global Navigation Satellite System (GNSS) and Digisonde measurements, and models (International Reference I onosphere, IRI 2020 and IRI -Plas 2017) to examine variations in the critical frequency (foF2) and height of peak electron density (hmF2) at F2-layer and Total Electron Content (TEC). The peak diurnal Digisonde -derived foF2 and GNSS TEC values observed on 0 1 February 2022 (a relatively quiet day) were significantly enhanced by about 61% and 70%, respectively on 04 February 2022 (recovery phase), near the Starlink satellite launch station (EG931). The substantial increases in foF2 and TEC values may be attrib uted to heightened solar wind parameters (notably 350% peak Bz decease and 638% plasma beta increase on 03 February 2022, 125% Bz decrease, 300% density and 95% plasma beta increase on 04 February 2022 compared to 01 February 2022). The 11 May 2024 storm p roduced reductions in both foF2 and TEC values on most of the time during the main phase compared to the initial and recovery phases. However, compared to the quiet time variations the parameters show enhancements, with the highest (about 219%) being seen by the diurnal GNSS TEC values at the low latitude station of AS00Q.