AAS 200th meeting, Albuquerque, NM, June 2002
Session 69. First Results from RHESSI
SPD Display, Thursday, June 6, 2002, 9:20am-4:00pm, SW Exhibit Hall

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[69.05] Soft-hard-soft spectral evolution observed at HESSI resolution

H.S. Hudson (UCB), B.R. Dennis (GSFC), S. Krucker, R.P. Lin (UCB), J. Sato (MSU), R. A. Schwartz (GSFC), D. M. Smith (UCB)

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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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.