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Abstract:
The aim of the present project was to apply computational tools based on the theory and practice of inverse problems for inferring information on the dynamical processes occurring during solar flares. More precisely, we processed hard X-ray counts provided by the NASA satellite RHESSI (Reuven Ramaty High Energy Solar Spectroscopy Imager), on orbit since February 2002, in order to reconstruct images of the flaring electron distribution in the solar chromosphere at different energies, within an imaging spectroscopy framework. Specifically, the project focused on: the formulation and validation of a regularization procedure which allowed the synthesis of electron maps at different electron energies from calibrated measurements, called visibilities, of specific spatial Fourier components of the source distribution; the application of such a methodology to RHESSI data sets recorded during events of different magnitude and topography together with a rigorous statistical interpretation of the results. The main results of the project have been collected in the following papers: 1) Prato M, Piana M, Emslie A G, Hurford G J, Kontar E P and Massone A M 2009 A regularized visivisibility basedroach to astronomical imaging spectroscopy SIAM J. Imaging. Sci. 2 910-930: in this paper we provide the mathematical foundation of a new approach to imaging spectroscopy, in which electron maps smoothed along the electron energy direction are reconstructed from the X-ray visibility observed by the Reuven Ramaty High Energy Solar Spectroscopy Imager (RHESSI). 2) Massone A M, Emslie A G, Hurford G J, Prato M, Kontar E P and Piana M 2009 Hard X-ray imaging of solar flares using interpolated visibilities Astrophys. J. 703 2004-2016: in this paper we describe a new imaging technique for the reconstruction of hard X-ray images from hard X-ray visibilities recorded by rotating modulation collimators. Further, we applied this imaging technique to real observations provided by RHESSI. 3) Prato M,
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. 15 Apr 2009-14 Apr 2010 |
| Pages: |
4 |
| Report Date: |
Jul 2012 |
| Contract Number: |
FA8655-09-1-3050 |
| Report Number: |
A443365 |
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Keywords relating to this report:
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