An Inverse Problem in Solar Physics: The RHESSI Mission and the July 23, 2002 Flare

Anna Maria Massone
INFM

Joint with J.C. Brown, A.G. Emslie, E.P. Kontar, M. Piana and R.A. Schwartz

The RHESSI mission has been launched by NASA on February 5, 2002 in order to provide crucial insights in the analysis of solar flares, by
combining 2D imaging with the spectral information given by high-resolution detectors.
In the spectral problem the relation between the measured photon spectrum and the mean flux electron spectrum is described by a Volterra integral equation of the first kind.
We apply the Tikhonov regularization algorithm to invert a RHESSI hard X-ray photon spectrum for a time interval near the peak of the July 23, 2002 event and infer information about the effective mean electron source spectrum. The reality of a significant dip recovered at intermediate energies is discussed.


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