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Determination Of Electron Flux Spectra In A Solar Flare With An Augmented Regularization Method: Application To RHESSI Data View all abstracts by submitter

Eduard Kontar   Submitted: 2004-09-08 12:09

Kontar et al. (2004) (Paper I) have shown how to recover mean source electron spectra in solar flares through a physical constraint regularization analysis of the bremsstrahlung photon spectra that they produce. They emphasize the use of non-square inversion techniques, and preconditioning combined with physical properties of the spectra to achieve the most meaningful solution to the problem. Higher-order regularization techniques may be used to generate {overline F}(E) forms with certain desirable properties (e.g., higher order derivatives). They further note that such analyses may be used to infer properties of the electron energy spectra at energies well above the maximum photon energy observed. In this paper we apply these techniques to data from a solar flare observed by RHESSI on 26 February, 2002. Results using different orders of regularization are presented and compared for various time intervals. Clear evidence is presented for a change in the value of the high-energy cutoff in the mean source electron spectrum with time. We also show how the construction of the injected (accelerated) electron spectrum F_0(E_0) (assuming that Coulomb collisions in a cold target dominate the electron energetics) is facilitated by the use of higher-order regularization methods.

Authors: E.P. Kontar, A.G. Emslie, M. Piana, A.M. Massone, and J.C. Brown
Projects: RHESSI

Publication Status: Solar Physics, (submitted)
Last Modified: 2005-12-07 05:25
Go to main E-Print page  PHYSICS OF THE SOLAR CORONA. AN INTRODUCTION  Generalized Regularization Techniques With Constraints For The Analysis Of Solar Bremsstrahlung X-Ray Spectra  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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