Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..361p&link_type=abstract
In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,
Astronomy and Astrophysics
Astrophysics
Methods: Data Analyses, Image Reconstruction, Sun: Observations
Scientific paper
Intrumental smoothing leads to image quality degradation and decreasing of the resolution. A Point Spread Function (PSF) is an important characteristic of optical device which can be considered as measure of image blurring. There are algorithms which permit to reconstruct an original image from observations if we know the PSF. A new algorithm of the PSF reconstruction from observations of quiet solar limb is proposed. Algorithm is based on solution of the convolutional Fredholm integral equation of the I-st kind with the observed blurred image of solar edge in the right hand side. It is assumed that 2D PSF can be presented as K(x,y) = X(x)Y(y). Original limb image in the wing of Hα has a sharp cut-off. In case of big magnification we can neglect limb curvature and consider it as a half-plane. It is shown, that the solution of integral equation can be found as X(x) = df(x)/dx, where f(x) is an observed blurred solar disk image averaged along y direction. Algorithm does not require any additional apriory assumptions on the PSF functional dependence. PSF obtained in such a way can be used for reconstruction of solar images to increase resolution. In the Crimean Astrophysical Observatory this method is used for improving images of solar prominences. Reconstructed images show fine fiber-structure of prominences which is not seen in original observations.
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