Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...86..301o&link_type=abstract
(Japan Society for the Promotion of Science and National Science Foundation, U.S.-Japan Seminar on the Recent Advances in the Un
Physics
63
Bursts, Solar Corona, Solar Flares, Solar X-Rays, X Ray Spectra, Coronal Loops, Energy Spectra, Thermal Radiation, X Ray Imagery
Scientific paper
Observational results are presented for five gradual and four impulsive type events from the hard X-ray imaging and spectrometer instruments on the Hinotori satellite. Four sets of differences are clearly observed between the gradual and impulsive type bursts. Hard X-ray images are found to show the existence of a large coronal source for each gradual burst and a wide variety of source structures for impulsive bursts. The source heights of the impulsive bursts are found to be low. All gradual bursts are found to exhibit power-law spectra, whereas impulsive bursts exhibit exponential thermal spectra at least before the maximum phase. Energy-dependent peak delays are found only in gradual bursts. It is concluded that two different acceleration and emission mechanisms are involved with these two kinds of hard X-ray bursts.
Nitta Nariaki
Ohki Kenichiro
Takakura Tastuo
Tsuneta Saku
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