Spectral variations of flare hard X-rays

Details Spectral variations of flare hard X-rays Spectral variations of flare hard X-rays

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..261h&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

13

Flares, X-Rays, Corona

Scientific paper

We report on a set of eight solar hard X-ray bursts corresponding to M-class flares and well-observed with the RHESSI and HXRS instruments. We find, as previously reported, that the impulsive phases of these events invariably show the soft-hard-soft spectral pattern (SHS) in which the power-law spectral index anticorrelates with the flux. The RHESSI data have higher spectral resolution but give the same result. The SHS pattern occurs in the spectral domain above the typical break energy of double power-law fits as well as below. Some of the events also show other patterns, including the soft-hard-harder evolutions seen in eruptive events. We discuss the physical interpretation of the spectral behavior.

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