Abstract Details
| Name: Komal Choraghe Affiliation: Indian Institute Of Astrophysics, (IIA) Bengaluru Conference ID: ASI2025_378 Title : THE MAGNETOSPHERIC RESPONSE TO DIFFERENT NEAR-EARTH SPACE WEATHER CONDITIONS Authors and Co-Authors : Komal Choraghe 1, Anil Raghav 2 Abstract Type : Oral Abstract Category : Thesis Abstract : Space weather, originating from the Sun, encompasses a range of disturbances that profoundly impact Earth’s surrounding space environment. Solar flares, coronal mass ejections (CMEs), corotating interaction regions (CIRs), and solar energetic particle events are the major drivers of space weather and can disrupt Earth’s communication networks, navigation systems, power grids, and satellite electronics. Severe space weather conditions reveal various phenomena, one being geomagnetic storms, primarily driven by interactions between the Sun’s and Earth’s magnetic fields. Investigating the recovery phase of geomagnetic storms is essential for understanding and predicting these phenomena. Our statistical analysis of 31 extreme geomagnetic storms over the past 30 years reveals a consistent dual-phase recovery pattern: an initial rapid phase followed by a slower phase. This initial recovery is well-modeled by exponential and hyperbolic decay functions, while the slower phase predominantly follows a constant decay function, suggesting a unified process underlying this gradual recovery. Our detailed analysis of ICME-induced extreme storms highlights a unique case where Alfvén waves present during the slow recovery phase contribute to a prolonged storm recovery period. For CIR-driven storms, typically weak to moderate, our study spanning 1996 to 2016 identifies twelve cases of intense storms induced solely by CIRs, with no ICME influence. Notably, in 83% of these events, a planar magnetic structure (PMS) emerged during the main phase, implying that nearly 2D PMS-like structures may strengthen the southward component (Bz) and enhance storm intensity during CIR-driven events. These findings provide crucial insights into the dynamics of extreme and intense storms and highlight specific mechanisms contributing to prolonged recovery and storm intensification. |