Morphology and Spectral Behavior of Solar Hard X-Ray Sources

Details Morphology and Spectral Behavior of Solar Hard X-Ray Sources Morphology and Spectral Behavior of Solar Hard X-Ray Sources

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxaa..38..121f&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 38, pp. 121-126 (2002) (http://www.astroscu.unam.mx/~rmaa/)

Astronomy and Astrophysics

Astronomy

Sun: Flares, Sun: X-Rays

Scientific paper

Images of 17 solar flares, corresponding to 61 individual X-ray bursts observed in four energy bands (14-23, 23-33, 33-53, and 53-93 keV) by the Hard X-Ray Telescope (HXT) experiment aboard the Yohkoh satellite have been investigated. The images suggest that the angular size of the hard X-ray sources is of the order of 20 arcsec and that they are of three types: single isolated sources ( ~ 30%), double sources ( ~ 41%), with typical minimum separation of 30-40 arcsec, and multiple sources ( ~ 29%). We have fitted a single power law spectrum to the X-ray emission in the range 20-830 keV, using data from the Hard X-Ray Spectrometer (HXS) experiment. The spectral time evolution of these bursts has been also investigated. Typical spectral index behavior is ``soft-hard-soft''.

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