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Published 2003 | public
Book Section - Chapter Open

The ^3He-Rich SEP Events of August 2002: Exceptional Elemental and Isotopic Composition Patterns at Energies Above 10 MeV / Nucleon

Abstract

Heavy-ion composition observations from the Solar Isotope Spectrometer on ACE are reported for four ^3He-rich solar-energetic-particle (SEP) events that occurred in August 2002. The abundance enhancement patterns are not monotonic functions of atomic number (or mass), such as is commonly found in 3He-rich events, but have large enhancements of abundance ratios between some neighboring elements (e.g., N/O) and between isotopes of some elements (e.g., 26Mg/24Mg). The possibility that these patterns could be indicative resonant acceleration of particles within a narrow range of charge-to-mass ratios is considered.

Additional Information

Copyright 2003 by Universal Academy Press, Inc. This work was supported by NASA at Caltech (under grants NAG5-6912 and NAG5-12929), JPL, and GSFC.

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August 19, 2023
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