halo CME

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A class of coronal mass ejection (CME) that appears as an expanding halo of gas around the Sun in coronagraph images such as obtained by the Solar and Heliospheric Observatory (SOHO). A halo CME occurs when the emitted gas is directed along the line of sight towards the observer. Because they are moving towards us, halo CMEs are more likely to produce effects at the Earth than other CMEs.

Subjects: Astronomy and Astrophysics.

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