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  • SOLAR PHYSICS  (3)
  • 1985-1989  (3)
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  • 1
    Publication Date: 2011-08-19
    Description: The determination of flare neutrino flux is approached from the standpoint of recent observations and theoretical results on the nuclear processes in solar flares. Attention is given to the energy spectra and total numbers of accelerated particles in flares, as well as their resulting production of beta(+)-emitting radionuclei and pions; these should be the primary sources of neutrinos. The observed 0.511 MeV line flux for the June 21, 1980 flare is compared with the expected from the number and spectrum of accelerated particles.
    Keywords: SOLAR PHYSICS
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  • 2
    Publication Date: 2013-08-31
    Description: Solar flare neutrons and gamma rays are produced by nuclear interactions of flare accelerated ions in the solar atmosphere. A rich variety of such gamma ray and neutron observations have been made by the Solar Maximum Mission (SSM), other satellite, balloon and ground based detectors, and they have provided a wealth of unique information on the nature of particle acceleration in flares and on the flare process itself. What we have learned from these observations is briefly reviewed, and what we can hope to learn from more sensitive new observations to be made with the Gamma Ray Observatory (GRO), the Max '91 balloon program, and the Nuclear Astrophysics Explorer is outlined.
    Keywords: SOLAR PHYSICS
    Type: NASA, Goddard Space Flight Center, Max '91 Workshop 2: Developments in Observations and Theory for Solar Cycle 22; p 33-34
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  • 3
    Publication Date: 2019-07-12
    Description: 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.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 341; 516-532
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