Are There Two Classes of Solar Particle Events?

Details Are There Two Classes of Solar Particle Events? Are There Two Classes of Solar Particle Events?

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31a04c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31A-04

Other

7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions

Scientific paper

In the last ten years or so, studies of solar energetic particles have worked within a simple paradigm that there are two classes of events. In one class, particle acceleration is related to a flare process. The clearest signature of this flare process is the presence of a type III (fast-drift) radio burst. These particle events are supposedly not associated with coronal mass ejections (CMEs). However, from a study of a small sample of flare particle events (reported from the ACE instrument) it was found that about 50% are associated with CMEs. In the other class of particle event, flares are thought to be irrelevant and all the particles are presumed to be accelerated at shocks driven by CMEs. However, in a study of recent particle events it has been found, using radio observations from the Wind/WAVES experiment, that all particle events are preceded by a fast-drift burst indicating that flare processes are also associated with these events. These observations suggest that there exists a continuum of event properties.

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