Physics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....4...79f&link_type=abstract
International Cosmic Ray Conference, 18th, Bangalore, India, Aug. 22-Sept. 3, 1983, Paper. 4 p.
Physics
Line Spectra, Solar Flares, Solar Spectra, Neutron Spectra, Solar Maximum Mission, Time Dependence
Scientific paper
Consideration is given to the time dependence of 2.22 MeV emission using observations of the Solar Maximum Mission gamma-ray spectrometer. A determination is made of the decay time constant for the 2.22 MeV emission process; from this determination, implications are then drawn concerning the density at which neutrons are captured and the value of the He-3/H ratio. In addition, an upper limit is set on the number of low energy neutrons produced in solar flares. The 2.22 MeV line is seen as providing a unique tool for probing the physics of the solar atmosphere. This is because neutrons that produce the line penetrate to depths exceeding the opacities at which optical observations can be made. It is found that a measurement of the time constant during the first 150 seconds after the impulsive phase of the flare on June 3, 1982, is essentially a measurement of the time constant for 2.22 MeV emission from the 'plateau' density of approximately 1.3 x 10 to the 17th H/cu cm.
Chupp Edward L.
Forrest David J.
Kanbach Gottfried
Prince Thomas A.
Share Gerald H.
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