Multi-Observational Analysis of a Rotating CME from Solar Eruption to Earth Impact

Authors: Ying Wang(NJIT), Yan Xu (NJIT), Haimin Wang(NJIT)

Previous studies have shown that rotation can impact the orientation of Interplanetary Coronal Mass Ejections (ICMEs) as they travel to Earth. In this study, we present an event that exhibited significant rotation following an eruption on September 16, 2023. A large filament erupted at approximately 9:12 UT  near the solar disk center. The corresponding  ICME arrived at Earth on September 19th, inducing a geomagnetic storm with a Dst index of -80. During this event, along the direction from the Sun to the Earth, multiple instruments took observations at different distances from the Sun, including in-situ measurements by PSP and Wind, near the Earth observations by SDO, LASCO and STEREO A. Such a configuration provides an unique opportunity in studying the rotation of ICMEs. We employ multiple models, such as GS, GCS to reconstruct the topologies of this ICME at different locations and make comparisons with observations.

This comprehensive approach allowed us to trace the entire propagation process of the ICME and propose a possible explanation for the observed rotation dynamics.