Solar Coronal and photospheric abundances from solar energetic particle measurements

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Abundance, Energetic Particles, Ion Distribution, Ionization, Photosphere, Radiation Measurement, Solar Atmosphere, Solar Corona, Solar Cosmic Rays, Charge Distribution, Chemical Composition, Ion Production Rates, Solar Flares, Stellar Structure, Voyager Project

Scientific paper

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 3 Z or = 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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