Abstract. Coronal mass ejections (CMEs) are a key feature of coronal and interplanetary (IP) dynamics. Major CMEs inject large amounts of mass and magnetic fields into the heliosphere and, when aimed Earthward, can cause major geomagnetic storms and drive IP shocks, a key source of solar energetic particles. Studies over this solar cycle using the excellent data sets from the SOHO, TRACE, Yohkoh, Wind, ACE and other spacecraft and ground-based instruments have improved our knowledge of the ... Coronal mass ejections are the prime source of strong geomagnetic storms and thus are very important to keep an eye on. The animation below shows a coronal mass ejection as seen by LASCO onboard the SOHO spacecraft. A coronal mass ejection can escape from the Sun during eruptions on the Sun like solar flares and filament eruptions. coronal mass ejection (CME), large eruption of magnetized plasma from the Sun ’s outer atmosphere , or corona, that propagates outward into interplanetary space. The CME is one of the main transient features of the Sun. Coronal Mass Ejections , or CMEs, are explosive bursts of solar plasma and magnetic field that fly away from the Sun at thousands of kilometers an hour. CMEs are frequently (but not always) associated with solar flares.
