A5091921055- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
University of Mumbai
2023-2024
Interplanetary coronal mass ejections (ICME) are large-scale eruptions from the Sun and prominent drivers of space weather disturbances, especially intense/extreme geomagnetic storms. Recent studies by our group showed that ICME sheaths and/or magnetic clouds (MC) could be transformed into a planar structure (PMS) speculate these structures might more geo-effective. Thus, we statistically investigated geo-effectiveness non-planar MC regions. We analyzed 420 events observed 1998 to 2017,...
Abstract Waves in plasma play an essential role the energy transfer and plasma-heating processes. This article discusses situ observation of Alfvén ion cyclotron (AIC) waves their characteristics within interplanetary coronal mass ejection (ICME) flux ropes. We analyzed 401 ICME ropes, observed by WIND spacecraft from 1995 to 2021 at 1 au. found only five ropes that show explicit presence AIC waves; two have normalized magnetic helicity σ m ≤ −0.5, remaining three ≥ 0.5 polarization. The...
Interplanetary Coronal Mass Ejections (ICMEs) are prominent drivers of space weather disturbances and mainly lead to intense or extreme geomagnetic storms. The reported studies suggested that the planar ICME sheath magnetic clouds (MCs) cause Here, we investigated severe two-step storm ($Dst \sim -187$ nT) 25$^{th}$ solar cycle. Our analysis demonstrates flattened (pancaked) structures, i.e., quasi-planar structures (PMS). study corroborates our earlier finding less adiabatic expansion in...