Sky science
Coronal Mass Ejection
Direct answer
Coronal Mass Ejection: A Coronal Mass Ejection is a large expulsion of magnetized plasma from the solar corona into interplanetary space.
It is an eruption of coronal matter and magnetic field.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Solar Granulation, Solar Prominence, Solar Wind, Heliosphere
It is an eruption of coronal matter and magnetic field.
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The story behind Coronal Mass Ejection
Space-based coronagraphs made routine CME detection and tracking possible.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Coronal Mass Ejection matters
Earth-directed CMEs can drive geomagnetic storms after traveling through the heliosphere.
Coronal Mass Ejection in practice: an example
A fast CME can arrive near Earth days after leaving the Sun.
Where readings of Coronal Mass Ejection go wrong
A solar flare and CME are distinct phenomena and do not always occur together.
Sources and editorial method
Research references used for this entry include:
- NASA Science: The Sun - NASA reference for solar structure, activity, the solar wind, and heliophysics.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Trace an eruption through space
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Common questions
What is a Coronal Mass Ejection?
A Coronal Mass Ejection is a large expulsion of magnetized plasma from the solar corona into interplanetary space.
What do people get wrong about a Coronal Mass Ejection?
A solar flare and CME are distinct phenomena and do not always occur together.
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