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Elemental Composition of Solar Energetic Particles in 1977 and 1978

Cook, W. R. and Stone, E. C. and Vogt, R. E. and Trainor, J. H. and Webber, W. R. (1979) Elemental Composition of Solar Energetic Particles in 1977 and 1978. In: Proceedings of the 16th International Cosmic Ray Conference. Vol.12. University of Tokyo Press , Tokyo, Japan, pp. 265-270.

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Measurements of the elemental composition of energetic nuclei with atomic numbers between 2 and 28 from seven major solar flares from September 1977 to May 1978 are presented. The abundance observations were made with the Low Energy Telescope systems of the cosmic ray detector systems on board the Voyager 1 and 2 spacecraft between 1 and 3 AU. Examination of the abundance ratios of the flare nuclei relative to oxygen reveals significant variations from event to event and between energetic nuclei and photospheric abundances, with an average composition, except for C and N, very similar to that of the galactic cosmic ray source. For the four flare events for which the elemental abundances exhibit no significant energy dependence in the energy range observed, it is found that the enhancement of energetic nuclei relative to their photospheric abundance are similar and not monotonic with atomic number, with the metallic nuclei showing an enhancement factor of approximately 5 and the volatiles showing one closer to 1.

Item Type:Book Section
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Stone, E. C.0000-0002-2010-5462
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Additional Information:Copyright IUPAP. This work has been supported in part by the National Aeronautics and Space Administration under contract NAS7-100 and grant NGR-05-002-160.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
Subject Keywords:Chemical Composition, Energetic Particles, Nuclei (Nuclear Physics), Solar Flares, Solar Radiation, Abundance, Oxygen, Photosphere, Voyager 1 Spacecraft, Voyager 2 Spacecraft
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Space Radiation Laboratory1979-08
Record Number:CaltechAUTHORS:20140417-134800183
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45011
Deposited By: SWORD User
Deposited On:21 Apr 2014 18:44
Last Modified:20 Feb 2020 14:33

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