EARTH SCIENCE SERVICES > ENVIRONMENTAL ADVISORIES > SPACE WEATHER ADVISORIES > CORONAL MASS EJECTION
A disturbance of the Sun's corona involving eruptions from the lower part of
the corona and ejection of large quantities of matter into the solar wind.
These ejecta sometimes have higher speed, density, and magnetic field strength
than is typical for the solar wind. If their speeds relative to the background
solar wind are high, they can produce shocks in the plasma that precede them as
they move outward.
Space Studies Board, Commission on Physical Sciences, Mathematics, and
Applications National Research Council http://www.nas.edu/ssb/glossary.html