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Bimodal abundances in the energetic particles of solar and interplanetary origin
Reames, Donald V.
AA(NASA, Goddard Space Flight Center, Greenbelt, MD)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 1, 1988, p. L71-L75. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Abundance, Energetic Particles, Interplanetary Medium, Solar Flares, Stellar Mass Ejection, International Sun Earth Explorers, Shock Wave Propagation
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This letter reports the first results from an examination of the daily-averaged abundances of the elements from H through Fe as well as electrons and isotopes of He in energetic particles observed in interplanetary space by the ISEE 3 spacecraft over an 8.5 yr period. The abundances of heavy elements such as Fe/O show, for the first time, clear evidence of the presence of two distinct populations of particles. Earlier observations could be interpreted as extreme variations within a single population. The population with enhanced Fe/O shows correlated enhancements in He-3/He-4, p/e, and He/H. This population is consistent with material that has been processed to high temperatures in the impulsively heated regions of solar flares. The second population, with more normal abundances, is probably accelerated from ambient material by coronal and interplanetary shocks.

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