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Spacecraft measurements of the elemental and isotopic composition of solar energetic particlesWithin 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. These new observations are discussed, focusing on: (1) the energy dependence of the elemental composition at energies not greater than 1 MeV/nucleon; (2) flare to flare variations in the composition; and (3) comparisons of the average solar particle abundances (Z not less than 2 and not greater than 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.
Document ID
19810064404
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mewaldt, R. A.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Solar Physics
Meeting Information
Meeting: Conference on The ancient sun: Fossil record in the earth, moon and meteorites
Location: Boulder, CO
Start Date: October 16, 1979
End Date: October 19, 1979
Accession Number
81A48808
Funding Number(s)
CONTRACT_GRANT: NGR-05-002-160
CONTRACT_GRANT: NAS5-20721
Distribution Limits
Public
Copyright
Other

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