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Solar coronal and photospheric abundances from solar energetic particle measurements
Breneman, H. H.; Stone, E. C.
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. L57-L61. Previously announced in STAR as N85-34786. (ApJL Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Abundance, Energetic Particles, Ion Distribution, Ionization, Photosphere, Radiation Measurement, Solar Atmosphere, Solar Corona, Solar Cosmic Rays, Charge Distribution, Chemical Composition, Ion Production Rates, Solar Cosmic Rays, Solar Flares, Stellar Structure, Voyager Project
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Solar energetic particle (SEP) elemental abundance data from the cosmic ray subsystem (CRS) aboard the Voyager 1 and 2 spacecraft are used to derive unfractionated coronal and photospheric abundances for elements with Z = 6-30. It is found that the ionic charge-to-mass ratio (Q/M) is the principal organizing parameter for the fractionation of SEPs by acceleration and propagation processes and for flare-to-flare variability, making possible a single-parameter Q/M-dependent correction to the average SEP abundances to obtain unfractionated coronal abundances. A further correction based on first ionization potential allows the determination of unfractionated photospheric abundances.

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