| Term: | coronal mass ejection |
| Definition: |
An outflow of plasma from or through the solar corona. CMEs are often, but not always, associated with erupting prominences, disappearing solar filaments, and/or flares. CMEs vary widely in structure, density, and velocity. Large and fast CMEs can approach densities of 1016 g and velocities of 2000 km/s. Earth impacting CMEs can result in significant geomagnetic storms. |