Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2407d&link_type=abstract
American Astronomical Society, SPD meeting #42, #24.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The origin of SEPs is still debated today. There is evidence to support an origin rooted deep within the solar corona, e.g. a flare origin, as well as evidence for an origin as far out as several solar radii from coronal shocks or CMEs. The composition, spectra, and time dependencies are tell-tales of SEP origin. Another key indicator of SEP origin is the accelerated ion distribution at the flare deduced from neutral radiation: gamma-rays and neutrons. For large flares, comparisons appear to suggest an origin divided between an escaping flare population and a population of coronal particles (or some admixture) accelerated through CME-driven shocks. Small flares conform to a different picture in which their origin is rooted at the flare. These small flares, as defined by their X-ray emission, have been found to correlate with the presence of small "impulsive” (enriched in electrons and heavy nuclei) SEP events, suggesting that small SEP events are dominated by flare particles. However, small SEPs are generally not accompanied by nuclear gamma-ray emission as might be expected if their origin is at the flare. The existence of this emission is not clear due to a lack in instrumentation capable of operating above the sensitivity threshold for observing gamma-ray emission from small flares (< C-class). The COMPton TELescope (COMPTEL) aboard the Compton Gamma Ray Observatory (CGRO) provided unprecedented, and as yet unsurpassed, sensitivity to γ rays in the 0.7 to 30 MeV energy range. Focusing on COMPTEL data from 2000, a cursory search has identified a handful of gamma-ray flares that are associated with 3He-rich SEP events. We present preliminary results of the spectral analysis of these flares and discuss the correlations between small impulsive or 3He-rich SEP events.
de Nolfo Georgia
Young Carolynn
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