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| Title: | IN-FLIGHT ANALISYS of
the YOHKOH PSF FUNCTION |
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| Authors: | S. Gburek and J. Sylwester | |
| Abstract: | Instrumental blurring is one of the main factors which affects quality of telescopic images. Blurring causes problems with interpretation of recorded images, obscures morphology of observed structures and spoils photometric precision. Several methods, called commonly deconvolution methods, (ANDRIL, MEM IRIS, LUCY, PIXON, etc.) have been invented specifically for the purpose of deblurring astronomical images. Majority of these methods assume a priori knowledge of the physical instrument response to a point source which is described by point spread function (PSF). Hence, the question of determining PSF becomes critical. We show a novel method of recovering in-flight PSF of satellite-born telescopes directly from the measured images. Presented method is especially useful for solar instruments as it works with the (non point-like) extended sources. One of the rare opportunities for the investigation of the shape of the PSF is the use of solar eclipses. There were several of them seen by Yohkoh. However only some have had the importance on the subject. The essence of the presented method consists in realising that the shape of PSF is certainly going along the steepest slopes present in the data. In respect to this we have performed the analysis of selected images where the recovery of the PSF has been well defined. Our starting concept was to look into the SXT patterns where substantial coverage of the intensity measurements was available and the sources looked confined. |
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