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The RHESSI Imaging Concept View all abstracts by submitter

Gordon J. Hurford   Submitted: 2002-09-19 14:24

The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) images solar hard X-ray and gamma-rays from 3 keV to 15 MeV with spatial resolution as high as 2.3 arcseconds. Instead of conventional optics, nine rotating modulation collimators are used to time-modulate the incident flux as the spacecraft rotates in a manner which depends on the location and morphology of the source. Starting from the arrival time of individual photons, ground-based software then uses the time-modulated signals to reconstruct the image of the source. The purpose of this paper is to convey both and intuitive feel and the mathematical basis for this imaging process along with its strengths and weaknesses. Following a review of the relevant hardware, the imaging principles and the basic back projection method are described, along with their relation to Fourier Transforms. Several specific algorithms (CLEAN, MEM. PIXONS and Forward Fitting) applicable to RHESSI imaging are briefly described.

Authors: G. J. Hurford, E. J. Schmahl, A. J. Conway, B. R. Dennis, R. A. Schwartz, R.P.Lin, J. McTiernan, D. M. Smith, C. Johns-Krull, A. Csillaghy, M. J. Aschwanden and T. R. Metcalf
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Publication Status: Solar Physics (in press)
Last Modified: 2002-09-20 11:37
Go to main E-Print page  The PMTRAS Roll Aspect System on RHESSI  The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)  Edit Entry  Download Preprint  Delete Entry 

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