European Space Weather Week 2025

Electrodynamic Forcing of the Duskside Ionosphere: The Super-Fountain Effect During the Gannon Superstorm of May 10-11, 2024

Not scheduled

15m

Mon 27/10: Idun - Tue 28/10, Wed 29/10: Studion

Poster SWR4 - Interactions in the Earth’s Magnetosphere-Ionosphere-Thermosphere System and their Space Weather Impact SWR4 –Interactions in the Earth’s Magnetosphere-Ionosphere-Thermosphere System and their Space Weather Impact

Speaker

Ms Indu Venugopal (Senior Research Fellow, Space Physics Laboratory, Vikram Sarabhai Space Centre, Indian Space Research Organisation (ISRO), Thiruvananthapuram, India)

Description

During the extreme geomagnetic storm on 10 May 2024, a pronounced super-fountain effect was triggered by prompt penetration electric fields (PPEF) and pre-reversal enhancement (PRE) electric fields. The SWARM-A satellite, with its favorable orbit through the dusk sector, captured detailed in-situ data revealing global-scale ionospheric responses. Strong equatorial uplift was observed, particularly between 20°E and 55°W longitudes, with enhanced EIA crest separation. Notably, this event provided the first direct in-situ evidence of significant electron temperature (T$_{e}$) increases in the evening equatorial ionosphere during such an extreme storm, with T$_{e}$ enhancements in the trough region of EIA. Additionally, localized westward electric fields and positive storm effects were detected near equator over adjacent longitudes, emphasizing the complex, region-specific nature of ionospheric disturbances under extreme space weather. Further details will be presented and discussed.