Coronal mass ejections (CME) - last update: 22 December 1998, 1450 UT (RR)

Coronal mass ejections (CME) are huge bubbles of gas ejected from the Sun over the course of several hours (Tousey, 1973; Brueckner, 1974; MacQueen et al., 1974; Gosling et al., 1974; for a recent review, see Hundhausen, 1996). They seem to be more related to prominence eruptions than solar flares. When travelling out from the Sun, term interplanetary CME (or ICME) is often used.

There are more CME events during maximum solar cycle years than during minimum years: number of daily events increase from about 0.5 to about 2.5. It has been shown that the major geomagnetic storms are created by CMEs hitting the Earth.


See also