Time Histories of Gamma-and Hard X-Ray Emissions from Solar Flares

概要

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The Hinotori gamma-ray spectrometer observed time histories of gamma-rayline and electron bremsstrahlung X-ray emissions from four solar flares. The timehistories of impulsive flares require that both nuclei and electrons are rapidlyaccelerated to energies >10 MeV/nuc and >1 MeV respectively in a time scaleof< 10 s, and the gamma-ray line peak is coincident with the electron brems-strahlung peak in<4 s, The gradual flare shows the gamma-ray line peak isapparently delayed by tens of seconds with respect to the electron bremsstrahlungpeak. The gamma-ray line peak delay is attributed either to the simultaneousacceleration of nuclei and electrons in one step and a longer life time of thenuclei against the injection, the propagation and the slowing down in the flareregion or to the second phase (step) acceleration of nuclei.
社団法人日本物理学会の論文
1984-12-15