Two Classes of Solar Energetic Particle Events: Time for a New Paradigm?

Details Two Classes of Solar Energetic Particle Events: Time for a New Paradigm? Two Classes of Solar Energetic Particle Events: Time for a New Paradigm?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh62a..11v&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH62A-11

Physics

2118 Energetic Particles, Solar, 2139 Interplanetary Shocks

Scientific paper

The current paradigm for solar energetic particle (SEP) events is that there are two classes of events, impulsive and gradual. The former have heavy element abundances enhanced relative to coronal abundances and are associated with small, well-connected solar flares. The latter are associated with shocks driven by Coronal Mass Ejections. The elemental abundances in gradual events might be expected to match coronal abundances; however the observed abundances show significant temporal variations during events as well as from event to event. These variations have been explained by rigidity dependent propagation, the build-up of waves in the vicinity of the shock, and the presence of particles from prior impulsive events. Since the beginnings of this paradigm there have been questions as to whether the two classes of events are truly distinct or are merely on opposite ends of a continuum of possibilities. Alternatively, it has been suggested that some events are hybrids of the two types. It has recently been argued by Reames that the two classes are truly distinct and that hybrids do not occur. We will present observations of SEP events made by the Solar Isotope Spectrometer on-board the ACE spacecraft which we find difficult to explain in terms of the current paradigm. This work was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.

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