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An Explanation for Non-Power-law Behavior in the Hard X-ray Spectrum of the July 23, 2002 Solar View all abstracts by submitter

Eduard Kontar   Submitted: 2003-03-26 14:51

High-resolution RHESSI data reveal that solar flare hard X-ray spectra show systematic deviations from power-law behavior. Even for injection of a power-law electron spectrum, such deviations are expected because of a number of effects, including nonuniform target ionization and solar albedo backscattering of the primary hard X-ray flux. In this paper we examine 1 keV resolution hard X-ray spectra for the intense July 23, 2002 event, corrected for the effects of decimation, pulse pile-up and background. We find that the observed spectra indeed deviate from a power-law behavior in a manner consistent with the effects of nonuniform target ionization. Further, this interpretation of the observed deviations requires that the amount of coronal material increases during the initial phase of the flare. The implications of this discovery for models of atmospheric response to flare heating are discussed.

Authors: E.P. Kontar, J.C. Brown, A.G. Emslie, R.A. Schwartz, D.M. Smith, and R.C. Alexander
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Publication Status: ApJ Letters (in press)
Last Modified: 2003-03-26 14:51
Go to main E-Print page  Nonuniform Target Ionisation and Fitting Thick Target Electron Injection Spectra to RHESSI Data  Rapid Acceleration of a Coronal Mass Ejection in the Low Corona and Implications for Propagation  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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