Neutron and 2.223 MeV gamma-ray line emission from solar flares

Details Neutron and 2.223 MeV gamma-ray line emission from solar flares Neutron and 2.223 MeV gamma-ray line emission from solar flares

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........9h&link_type=abstract

Ph.D. Thesis California Univ., San Diego.

Computer Science

8

Angular Distribution, Gamma Rays, Monte Carlo Method, Neutrons, Particle Acceleration, Solar Flares, Solar Neutrons, Abundance, Emission Spectra, Energy Spectra, Line Spectra

Scientific paper

Systematic calculations of the neutron and 2.223 MeV gamma-ray line production in solar flares and their escape fluxes as a function of angle, energy, and time were performed. With a connected system of Monte Carlo programs, the depth, energy and angular dependences of neutron production and their subsequent capture gamma-ray line emission in the solar atmosphere were calculated as a function of the accelerated ion energy spectrum and angular distribution, and then the attenuation of the escaping neutrons and gamma-rays were calculated as a function of energy and observing angle, or heliocentric position. The calculation also gave the time dependent 2.223 gamma-ray and neutron flux at the Earth. Comparisons of the results of these calculations with solar flare gamma ray and neutron observations have yielded important information on both the flare accelerated ions and the solar He-3 abundance.It was found that the accelerated ions trapped at the Sun have a relatively narrow range of energy spectra, which is almost identical to that of the accelerated ions observed in the interplanetary medium, implying the same acceleration process for both.

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