Restoration of Long-Exposure Full-Disk Solar Intensity Images

Details Restoration of Long-Exposure Full-Disk Solar Intensity Images Restoration of Long-Exposure Full-Disk Solar Intensity Images

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...478..817t&link_type=abstract

Astrophysical Journal v.478, p.817

Astronomy and Astrophysics

Astronomy

11

Atmospheric Effects, Techniques: Image Processing, Sun: General

Scientific paper

We describe an algorithm for restoring full-disk solar intensity images blurred by a smooth, quasi-stationary point-spread function (PSF). For Earth-based observations, this type of data can be obtained by using exposure times that are much longer than the redistribution time of the atmosphere. Using simulated data for a wide range of observing conditions, we show that the algorithm restores data in such a way that the RMS difference between an original, unblurred image and the restored image is typically less than 1.0%. Thus, we substantially improve the photometric precision. The simulations also show that under "reasonable" seeing conditions (<~4"), exposure times of 5--10 s are adequate to produce smooth calibratable PSFs if the observing instrument uses a centroid-shifting tip/tilt wavefront correction. The algorithm determines the PSF for each observation directly from the recorded image and does not require separate measurements of point sources.

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