Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ssrv...38...89k&link_type=abstract
Space Science Reviews (ISSN 0038-6308), vol. 38, May-June 1984, p. 89-141.
Astronomy and Astrophysics
Astronomy
71
Abundance, Helium Isotopes, Solar Cosmic Rays, Solar Flares, Astronomical Models, Energy Spectra, Heavy Ions, Hydrogen Isotopes, Ion Cyclotron Radiation, Solar Radio Emission, Solar Wind, Solar X-Rays, Turbulence Effects
Scientific paper
The formation of the observed solar cosmic ray (SCR) composition remains an open question. It has become particularly acute after the discovery of He-3-rich events. The He-3/He-4 abundance ratio revealed in such events exceeds substantially (up to four orders of magnitude) that in the solar atmosphere. The data available on the He-3-rich events are discussed and a list of all such events known up to date is presented. Most of the He-3-rich SCR events can be associated with the corresponding optical flares on the sun, with X-ray and radiobursts. An analysis of the models of He-3 enrichment proposed up to now shows that only preferential He-3 heating by plasma mechanisms can provide the observed high enrichment levels. A model involving preferential heating of He-3 by induced scattering on ions of the ion acoustic waves generated by flare associated electrons in the solar atmosphere is considered in detail. This model can account for the major properties of the He-3-rich flares. Observational implications of the He-3-rich solar flare model are analyzed; the predictions of the theory are compared with the experimental data available, and promising avenues of further relevant experimental and theoretical research are considered.
Kocharov Grant E.
Kocharov Leon G.
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