Two Classes of CMEs? The Evidence From LASCO Observations

Details Two Classes of CMEs? The Evidence From LASCO Observations Two Classes of CMEs? The Evidence From LASCO Observations

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31c01p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31C-01 INVITED

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7509 Corona, 7513 Coronal Mass Ejections

Scientific paper

Coronagraph observations suggest that CMEs may be divided into two classes, based primarily on their speed profiles as a function of radial distance from the Sun. Fast CMEs often accelerate impulsively close to the Sun, and emerge into the coronagraph field of view travelling at almost constant speed. Other events start out slowly, and gradually accelerate to about the ambient solar wind speed. The fastest events are usually associated with flares, while the slow, gradually accelerating, events are usually associated with erupting prominences. However, exceptions to these two cases exist, and it may be that the two classes are merely the extremes of a continuous distribution of CME properties. This paper will examine the observational evidence for dividing CMEs into two, or more, distinct classes, and will discuss whether different physical driving mechanisms are required to account for them.

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