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Published October 15, 1975 | Published
Journal Article Open

Enrichment of heavy nuclei in ^3He-rich flares


Five ^3He-rich solar-flare particle events were observed in 1973-1974 with ^3He/^4He ranging from 0.2 to ~8 at 2.9-12.7 MeV per nucleon. In all five events the (Z ≥ 6)/^1H ratio at ~3 MeV per nucleon was enriched by ~10 to ~100 times and the (Z ~ 6)/^4He ratio was enriched by ~3 to ~30 times, when compared with average solar-particle abundances measured over this 2-year period. It is suggested that the simultaneous enhancement of Z ≥ 6 and ^3He nuclei and the absence of ^2H and ^3H may be partly due to a preferential acceleration process which depends on the Z^2/A of the nuclei.

Additional Information

© 1975 American Astronomical Society. Received 1975 July 7. Dr. J. E. Lupton and W. E. Althouse made significant contributions to the design and development of the Electron/Isotope Spectrometer. This work was supported in part by the National Aeronautics and Space Administration under contract NAS5-11066 and grant NGR 05-002-160. One of us (G. J. H.) received support from NSF under GA 43200 during part of this work.

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Published - 1975ApJ___201L__95H.pdf


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