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Spacecraft Measurements of the Elemental and Isotopic Composition of Solar Energetic Particles

Mewaldt, R. A. (1980) Spacecraft Measurements of the Elemental and Isotopic Composition of Solar Energetic Particles. In: Proceedings of the the Conference on the Ancient Sun: Fossil Record in the Earth, Moon and Meteorites. Geochimica et cosmochimica acta. Supplement ; 13. Pergamon Press , New York, pp. 81-101.

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Within the past few years, instruments flown on satellites and space probes have made significant progress in measuring the elemental and isotopic composition of energetic heavy nuclei accelerated in solar flares. This paper discusses these new observations, focusing on: (1) the energy dependence of the elemental composition at energies ≥ 1 Me V/nucleon; (2) flare to flare variations in the composition; and (3) comparisons of the average solar particle abundances (2 ≤ Z ≤ 28) with other measures of the solar composition, including photospheric, coronal, and solar wind observations. These comparisons have led to the suggestion that solar flares sample the composition of the corona. Isotopic measurements of heavy solar flare nuclei have recently added a new dimension to these studies. In particular, the isotopic composition of solar flare neon has been found to be significantly different from that measured in the solar wind, but consistent with the meteoritic component neon-A.

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Mewaldt, R. A.0000-0003-2178-9111
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Additional Information:This work has benefited greatly from suggestions and comments by my colleagues at Caltech, including W. R. Cook, J. D. Spalding, E. C. Stone, and R. E. Vogt. I also acknowledge helpful discussions with G. M. Mason, R. E. McGuire, and W. R. Webber. I am grateful to the following for providing experimental data prior to publication: W. R. Cook (CRS experiments on Voyager 1 and 2); D. C. Hamilton and G. Gloeckler (LECP experiments on Voyager 1 and 2); G. M. Mason (University of Maryland/Max-Planck-Insitut experiment on IMP-8); and R. E. McGuire (Goddard Space Flight Center experiment on IMP-7 and 8). This work was supported in part by NASA under Contract NAS5-20721 and grant NGR 05-002-160.
Group:Space Radiation Laboratory
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NASANGR 05-002-160
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1980-01
Series Name:Geochimica et cosmochimica acta. Supplement ; 13
Record Number:CaltechAUTHORS:20140417-140336777
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45018
Deposited By: SWORD User
Deposited On:25 Apr 2014 21:18
Last Modified:22 Nov 2019 09:58

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