Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..487b&link_type=abstract
Astronomy and Astrophysics, v.316, p.487-492
Astronomy and Astrophysics
Astrophysics
Sun: Abundances, Sun: Flares, Sun: Particle Emission
Scientific paper
We identify 17 solar energetic particle (SEP) events with enhanced abundances of ^3^He relative to ^4^He detected by the Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies (HI-SCALE) on the Ulysses spacecraft. These events were all detected while Ulysses was within 5deg of the ecliptic plane, but at distances from the Sun of 1-5 AU. We compare these results to those obtained with the ONR-604 instrument on the Combined Release and Radiation Effects Satellite (CRRES) mission (Chen et al. 1995). Chen et al. found 13 events with enhancements of ^3^He above normal solar abundances at energies >50MeV/nucleon. The HI-SCALE instrument measures He ions with energies between 0.3 and 3.1MeV/nucleon. We identify flux increases in the HI-SCALE data which correspond to 6 of the CRRES events, but we find an enhancement in ^3^He in only one of these events. We believe this single coincident detection to be a chance occurrence. We use these results, together with the multitude of previous results at different energies, to discuss the overall picture of ^3^He-rich events as a function of energy. We also analyze the data for ^3^He enhancements in high latitude co-rotating interaction region (CIR)-associated events observed while the spacecraft was in the southern solar hemisphere above the streamer belt. We find, within the sensitivity of the HI-SCALE instrument, that there is no ^3^He enhancement in these CIR-associated events. We then briefly discuss how this relates to particle acceleration mechanisms in solar flares.
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