Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..211y&link_type=abstract
In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 211-214 (SEE N94-22624 05-75)
Physics
3
Gamma Ray Bursts, Gamma Ray Spectra, Solar Flares, Solar Observatories, X Ray Telescopes, Japanese Space Program, Nuclear Reactions, Particle Production, Solar Physics
Scientific paper
The Yohkoh gamma ray flare data obtained from the flares on 27 Oct., 15 Nov., and 3 Dec. 1991 are reported. The data was acquired with the Yohkoh gamma ray spectral observations. The 27 Oct. flare (X6.1/3B) shows a strong gamma ray line emission, while the 3 Dec. flare (X2.0/2B) shows a strong bremsstrahlung continuum extending to 10 MeV. High energy protons and ions were produced in the former flare, while electrons were preferentially accelerated in the latter flare. The line to bremsstrahlung flux ratio is variable within flares. A line feature at 420 keV was observed from the 15 Nov. flare (X1.0/3B). The following problems are discussed on the basis of the gamma ray light curves and energy spectra observed with Yohkoh: timings of electron and proton acceleration, the proton energy spectra in the 10 to 200 MeV band, the angular distribution of accelerated He nuclei, and the production of positron annhilation line at 511 keV.
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