Abstract
A gamma-ray spectrometer aboard the solar flare obsevation satellite HINOTORI launched on 21 Feb. 1981 is described. The gamma-ray spectrometer consists of a phoswich type scintillator of CsI(Tl) crystal surrounded by a plastic scintillator, which can discriminate between gamma-rays and charged particles. The CsI(Tl) scintillator, whose size is 62 cm 2 in area and 5.1 cm in height. covers the energy range 0.21–6.67 MeV. The energy resolution is 0.1E 1 2 (MeV) fwhm and the full energy peak efficiency is 0.40 at 0.662 MeV. The primary data output is a full resolution 128 channel pulse height spectrum every 2 s. Since the launch HINOTORI recorded about forty solar gamma-ray flares and four cosmic gamma-ray bursts, and several interesting results were reported. The typical results of the large solar flare on 27 April 1981 and the cosmic gamma-ray burst on 21 July 1981 are presented in this paper. These observed data could provide important clues for advancing our understanding of high enegry phenomena in solar flares and cosmic gamma-ray bursts.
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