Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l..91d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 15, 1979, p. L91-L95.
Astronomy and Astrophysics
Astrophysics
24
Abundance, Heavy Nuclei, Neon Isotopes, Particle Acceleration, Solar Cosmic Rays, Solar Flares, Carbonaceous Chondrites, Imp, Mass Distribution, Oxygen Isotopes
Scientific paper
The relative isotopic abundances of Ne-20 and Ne-22 in seven solar flares were determined from measurements of the satellite IMP 8, yielding the ratio Ne-20/Ne-22 = 7.7 (+2.3, -1.5) for solar chromospheric matter. This value is in agreement with the ratio for the component neon-A (the 'primordial' component) found in carbonaceous chondrites. An elemental abundance ratio Ne/O = 0.14 + or - 0.01 also has been obtained which agrees closely with earlier reported measurements. It is shown that the effects of preferential acceleration relative to solar-system abundances with increasing charge number observed for some solar flares - though biasing the elemental ratio - does not appear to influence the neon isotopic abundances.
Dietrich William F.
Simpson André J.
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