Soft-hard-soft spectral evolution observed at HESSI resolution

Details Soft-hard-soft spectral evolution observed at HESSI resolution Soft-hard-soft spectral evolution observed at HESSI resolution

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.6905h&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #69.05; Bulletin of the American Astronomical Society, Vol. 34, p.758

Astronomy and Astrophysics

Astronomy

Scientific paper

Hard X-ray bursts from solar flares show a strong correlation between spectral index and flux level in the 20-100 keV hard X-ray range. Prior to HESSI this pattern could mainly be studied only with scintillation counters, at relatively low resolution. HESSI has observed more than ten M-class flares, and we will report how this morphology appears at ~1-keV resolution for these events. Specifically, we address the question of whether the time evolution of the break energy in a double power-law fit can play a role in defining the soft-hard-soft morphology.

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