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The isotopic composition of solar flare accelerated magnesiumMeasurements of the abundances of three isotopes of magnesium in solar energetic particles are reported. Data were obtained from the Heavy Isotope Spectrometer Telescope on board the ISEE 3 spacecraft during a large solar particle event following the 2B solar flare of September 23, 1978. A two-dimensional maximum likelihood analysis of the mass determinations for each event, which were taken with a resolution of 0.23 amu, indicates a Mg-25/Mg-24 ratio of 0.14 (+0.05, -0.02) and a Mg-26/Mg-24 ratio of 0.15 (+0.04, -0.03) in the energy interval 12-36 MeV/n. The results are consistent with terrestrial magnesium isotope abundances.
Document ID
19810043472
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mewaldt, R. A.
(California Inst. of Tech. Pasadena, CA, United States)
Spalding, J. D.
(California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C.
(California Inst. of Tech. Pasadena, CA, United States)
Vogt, R. E.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
81A27876
Funding Number(s)
CONTRACT_GRANT: NAS5-20721
CONTRACT_GRANT: NGR-05-002-160
Distribution Limits
Public
Copyright
Other

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