Production of flare-produced H-2 and He-3

Details Production of flare-produced H-2 and He-3 Production of flare-produced H-2 and He-3

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..709r&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 709-714.

Astronomy and Astrophysics

Astronomy

Deuterium, Helium Isotopes, Nuclear Reactions, Particle Production, Solar Flares, Astronomical Models, Cross Sections, Monte Carlo Method, Proton Energy

Scientific paper

The kinematics and cross sections for the reaction H + He-4 yields He-3 + H-2 are examined, and a detailed Monte Carlo calculation is performed for this reaction to determine the kinematical regions where He-3 dominates. This analysis is conducted to investigate the thick-target and thin-target production models of Ramaty and Kozlovsky (1974) in terms of the relevant kinematics and cross sections. For the thin-target model, it is found that there are no regions where He-3 dominates. For the thick-target case, He-3 is found to dominate in the backward and perpendicular directions relative to the incident protons, and He-3/H-2 ratios of about 25 are found over the energy range from 1 to 5 MeV/nucleon. The hypothesis is analyzed that the measured He-3 ions are accelerated after being produced by protons impinging on the solar atmosphere, and it is shown that the required postproduction acceleration must occur over very small distances on a solar scale and before photospheric turbulence mixes the separated H-2 and He-3 components. It is concluded that a thick-target model based on primary-proton mirroring just below the solar surface is the most likely source of the He-3-enriched events.

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