Abundance variations and fractionation effects in a gradual SEP event

Details Abundance variations and fractionation effects in a gradual SEP event Abundance variations and fractionation effects in a gradual SEP event

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..127g&link_type=abstract

ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V

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2

Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

Using data from the ACE SEPICA experiment, we examine elemental abundance variations for C, O, Ne, Mg, Si and Fe for the 1998 April 21-23 ``pure'' gradual SEP event in the energy ranges 0.6-0.8 and 0.8-1.0 MeV/nucleon. The high FIP element Ne has SEP abundances (Ne/O) consistent with nominal photospheric and coronal values. Low FIP elements Mg, Fe, and Si show enhancements (relative to O) over both photospheric and coronal abundances. Power law fits to the SEP abundances (normalized to coronal values) as a function of measured /A are performed and evaluated. It is found that for this event the single-parameter power law assumption does not yield a consistently good fit. The derived power law index γ varies with both time and energy. .

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