Elemental abundance enhancements of large fe-rich gradual events

Details Elemental abundance enhancements of large fe-rich gradual events Elemental abundance enhancements of large fe-rich gradual events

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3120d&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

We report on a study of the largest of the gradual (CME driven) solar energetic particle events, as measured with the University of Chicago instrument on the IMP-8 satellite during solar cycles 21 and 22, in order to categorize these largest events. Our selection criterion for studying events is when the CNO flux exceeds 10-5 (cm2 sec ster MeV/nucleon)-1 for CNO above ~25 MeV/nucleon. The subset of gradual events whose Fe/O ratio is enhanced (≥1) is of great interest, both from a theoretical and practical point of view, and we have attempted to categorize these events. The enhanced-Fe gradual events can be divided into three broad subgroups. The first subgroup is a set of events for which the spectra of the heavy ions (e.g. Ca, S, Fe) is harder, and extends to higher energy, than that of the lighter ions (C and O),. The second subgroup of events spectra of identical shape for all heavy elements from C through Ni. When we compare the abundances of the heavy ions in this subset of gradual events to a general average abundance of heavy ions observed in all gradual events we see an increasing enhancement as an exponential function of charge. The final subset of Fe-enhanced gradual events looks very similar to the second subset, except that the C is relatively depleted and the Ne is additionally enhanced. This third subset shows abundance variations remarkably similar to those observed in some 3He-rich impulsive events.

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