The heavy-ion compositional signature in He-3-rich solar particle events

Details The heavy-ion compositional signature in He-3-rich solar particle events The heavy-ion compositional signature in He-3-rich solar particle events

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..849m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 849-860. Previously announced in STAR as N86-17255.

Astronomy and Astrophysics

Astrophysics

101

Heavy Ions, Heavy Nuclei, Helium Isotopes, Solar Cosmic Rays, Solar Flares, Abundance, International Sun Earth Explorers, Interplanetary Space, Particle Acceleration, Solar Corona

Scientific paper

A survey of the approx. 1 MeV/nucleon heavy ion abundances in 66 He-3-rich solar particle events was performed using the Max-Planck-Institut/University of Maryland and Goddard Space Flight Center instruments on the ISEE-3 spacecraft. The observations were carried out in interplanetary space over the period 1978 October through 1982 June. Earlier observations were confirmed which show an enrichment of heavy ions in He-3-rich events, relative to the average solar energetic particle composition in large particle events. For the survey near 1.5 MeV/nucleon the enrichments compared to large solar particle events are approximately He4:C:O:Ne:Mg:Si:Fe = 0.44:0.66:1.:3.4:3.5:4.1:9.6. Surprising new results emerging from the present broad survey are that the heavy ion enrichment pattern is the same within a factor of approx. 2 for almost all cases, and the degree of heavy ion enrichment is uncorrelated with the He-3 enrichment. Overall, the features established appear to be best explained by an acceleration mechanism in which the He-3 enrichment process is not responsible for the heavy ion enrichment, but rather the heavy ion enrichment is a measure of the ambient coronal composition at the sites where the He-3-rich events occur.

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