Multispacecraft Remote Sensing and In Situ Observations of the 2020 November 29 Coronal Mass Ejection and Associated Shock: From Solar Source to Heliospheric Impacts

Abstract We investigate the source eruption, propagation and expansion characteristics, heliospheric impacts of 2020 November 29 coronal mass ejection (CME) associated shock, using remote sensing in situ observations from multiple spacecraft. A potential-field source-surface model is employed to examine magnetic fields surrounding region. The CME shock are tracked early stage outer corona extreme ultraviolet white light observations. Forward models applied determine structures kinematics near Sun. shows an ellipsoidal structure, expands all directions, encloses whole Sun as viewed both SOHO STEREO A, which results large flux rope its fast acceleration. structure potential mainly determined by radial lateral expansions. arrive at Parker Solar Probe A. Only based on observations, it difficult predict whether when CME/shock would Earth. Combining Wind measurements Wang–Sheeley–Arge-ENLIL simulation results, we confirm that far flank (or leg) arrives Earth with no signature. These highlight importance multipoint for determining CMEs.