Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..938m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 938-961.
Astronomy and Astrophysics
Astrophysics
94
Abundance, Energetic Particles, Particle Acceleration, Solar Cosmic Rays, Solar Flares, Chemical Composition, Heavy Ions, Photosphere, Proton Flux Density, Shock Wave Propagation, Solar Corona, Stellar Spectrophotometry
Scientific paper
The present measurements of elemental abundances in 15 large solar energetic particle events confirm the existence of two major effects: systematic differences between solar energetic particle abundances and photospheric abundances that are approximately correlated with first ionization potential (implying that the solar corona is the likely source population for these particles), and an enhancement of heavy ion abundances relative to a baseline of solar energetic particle abundances whose magnitude increases with rising atomic number. These data suggest the possibility that the degree of heavy ion enhancement has some correlation with spectral slope, and confirm that the aforementioned effects are not due to time or energy variations within individual events. The maximum column density above the solar acceleration region is less than 0.1 g/sq cm, on the basis of these data.
McDonald Frank B.
McGuire Robert. E.
von Rosenvinge Tycho T.
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