Interpretation of the soft X-ray spectra from Hinotori |
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| Authors: | K Tanaka N Nitta K Akita T Watanabe |
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| Institution: | (1) Tokyo Astronomical Observatory, University of Tokyo, Mitaka, 181 Tokyo, Japan;(2) Department of Astronomy, University of Tokyo, Bunkyoku, Tokyo, Japan |
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| Abstract: | We present analyses of the soft X-ray iron line spectra of flares obtained from the Bragg Spectrometer on Hinotori. We first present a case of strong K emission at the impulsive phase of the hard X-ray burst, and assess net K emission due to the electron impact by eliminating the fluorescence contribution. Second we discuss on the differences in the electron temperatures and emission measures derived respectively from FeXXVI and FeXXV spectra. A pilot two-temperatures model which can explain the two spectra is presented. Finally, we compare the temporal relations between the soft X-ray and hard X-ray intensities and show two extreme classes of flares, one characterized by the efficient formation of a hot thermal plasma above 30 million degree, and the other characterized by the spiky hard X-ray component. Energetical relation of the thermal plasma to the electron beam is discussed for the two classes. |
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