Computer Science – Performance
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51a06s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP51A-06
Computer Science
Performance
7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos, 7594 Instruments And Techniques
Scientific paper
We developed an imaging tool used for High Energy Solar Spectroscopic Imager (HESSI), which will be launched this spring. HESSI will be the first instrument to observe solar flare hard X-rays with such high spatial (about 2 arcsec) and spectral (about 1 keV FWHM) resolutions. The instrument is a Fourier-synthesis-type telescope that measures a set of spatially modulated photon counts with the rotating collimators. We need use specialized algorithms in order to reconstruct an image from obeservational data. The HESSI team has developed various imaging techniques, e.g., back projection, forward-fitting, Clean, Maximum Entropy Method (MEM), MEM based on visibilites (MEMVIS) and MEM using pixons. The MEM uses photon count data directly and has characteristics to supress the noise level. We obtain sharp images of solar flares when there are sufficent photon counts. The advantages and disadvantages of MEM are presented using and we compare the performance with other methods in analyzing simulated HESSI data.
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