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A direct observation of solar neutrons following the 0118 UT flare on 1980 June 21
Chupp, E. L.; Forrest, D. J.; Ryan, J. M.; Heslin, J.; Reppin, C.; Pinkau, K.; Kanbach, G.; Rieger, E.; Share, G. H.
AA(New Hampshire, University, Durham, NH), AB(New Hampshire, University, Durham, NH), AC(New Hampshire, University, Durham, NH), AD(New Hampshire, University, Durham, NH), AE(Max-Planck-Institut für Physik und Astrophysik, Garching bei München, Germany), AF(Max-Planck-Institut für Physik und Astrophysik, Garching bei München, Germany), AG(Max-Planck-Institut für Physik und Astrophysik, Garching bei München, Germany), AH(Max-Planck-Institut für Physik und Astrophysik, Garching bei München, Germany), AI(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 263, Dec. 15, 1982, p. L95-L99. Bundesministerium für Forschung und Technologie (ApJL Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Gamma Ray Spectrometers, Neutron Spectra, Solar Corpuscular Radiation, Solar Flares, Solar Flux Density, Solar Maximum Mission, Solar Neutrons, Energetic Particles, Particle Acceleration, Photons, Spaceborne Astronomy, Temporal Resolution
Bibliographic Code:


The Gamma Ray Spectrometer on the Solar Maximum Mission satellite has observed energetic solar neutrons (greater than 50 MeV) at the earth following a solar flare that occurred on the west limb on June 21, 1980 at 01:18:20 UT. Impulsive photon emission from 10 keV to greater than 65 MeV lasting over a period of about 66 s was followed by a transient flux of 50-600 MeV neutrons incident over a 17 minute period. The peak counting rate corresponds to an average flux at the earth of (3.8 + or - 0.6) x 10 to the -2nd neutrons/sq cm s at 130 MeV. These observations indicate the emission of 3 x 10 to the 28th neutrons/sr with energies greater than 50 MeV, requiring the rapid acceleration (much less than 60 s) of protons to GeV energies during the impulsive phase of the flare.

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