Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..516h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 516-532.
Astronomy and Astrophysics
Astrophysics
61
Coronal Loops, Gamma Ray Spectra, Solar Flares, Solar Magnetic Field, Coulomb Collisions, Energy Dissipation, Line Spectra, Magnetohydrodynamics, Monte Carlo Method, Nuclear Astrophysics, Transport Theory
Scientific paper
A Monte Carlo simulation that follows individual ions throughout a solar flare magnetic loop is developed. Included are energy losses due to Coulomb collisions, removal by nuclear reactions, magnetic mirroring in the convergent flux tubes, and MHD pitch-angle scattering in the corona. Calculations are made of the depth distribution of nuclear deexcitation line production, the time dependence of the production of the lines, and the escape probability of the line photons from the solar atmosphere. It is found that the inclusion of mirroring and pitch-angle scattering leads to time profiles which are in good agreement with observations. This suggests that the decaying portions of the time profiles of gamma-ray emission observed from solar flares could be governed by transport and not by acceleration.
Hua Xin-Min
Lingenfelter Richard E.
Ramaty Reuven
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