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Enrichment of heavy nuclei in ^3He-rich flares

Hurford, G. J. and Mewaldt, R. A. and Stone, E. C. and Vogt, R. E. (1975) Enrichment of heavy nuclei in ^3He-rich flares. Astrophysical Journal, 201 (2). L95-L97. ISSN 0004-637X. doi:10.1086/181950.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
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.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
NSFGA 43200
Subject Keywords:abundances, solar; cosmic rays; flares, solar
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1975-11
Issue or Number:2
Record Number:CaltechAUTHORS:20140207-081349869
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Official Citation:Enrichment of heavy nuclei in He-3-rich flares Hurford, G. J.; Mewaldt, R. A.; Stone, E. C.; Vogt, R. E. Astrophysical Journal, vol. 201, Oct. 15, 1975, pt. 2, p. L95-L97.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43712
Deposited On:07 Feb 2014 17:29
Last Modified:10 Nov 2021 16:41

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