Physics – Optics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..374v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 374-390.
Physics
Optics
46
Image Resolution, Imaging Techniques, Solar Granulation, Speckle Interferometry, Atmospheric Optics, Image Processing, Telescopes
Scientific paper
Speckle interferometry and imaging methods can improve considerably the angular resolution of images observed with a solar telescope. This paper describes in detail an implementation of the Knox-Thompson speckle imaging technique which has been developed specifically for the needs of solar imaging, in order to produce photometrically accurate maps of the intensity of solar small-scale features. The technique can recover fields of view of arbitrary size, i.e., fields which may be much larger than the isoplanatic patch. A number of problems which are peculiar to solar observations have been identified and were solved in the course of development of the imaging procedures. These problems and their solution are also described in detail. It is demonstrated that the application of speckle imaging to solar data results in near-diffraction-limited performance with a 76 cm telescope at a wavelength of 600 nm +/- 3 nm when seeing conditions are good, but not necessarily exceptionally good.
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