Journal ArticleDOI
Changes in the atmospheric-lens modulation transfer function used for calibration in solar speckle interferometry
TLDR
In this paper, a method for the calibration of power spectra of nonstellar astronomical objects, by the use of changes in seeing conditions during speckle-interferometric measurements, is described.Abstract:
A method is described for the calibration of power spectra of nonstellar astronomical objects, by the use of changes in seeing conditions during speckle-interferometric measurements. Results are given for an application of this technique to solar granulation. The correction of 40 analyses, determined with Fried’s parameter r0 ranging between 2.5 and 11.5 cm, provides satisfactory convergence, and thus permits estimation of the solar granulation power spectrum for frequencies up to 2.5 arc sec−1.read more
Citations
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Electromagnetic beam propagation in turbulent media: An update
TL;DR: In this article, the authors reviewed the recent developments on wave propagation in turbulent media, including adaptive optics, intensity scintillations, pulse propagation, atmospheric measurements at visible, IR, and millimeter wave frequencies, speckle interferometry, and other related topics.
Journal ArticleDOI
Estimating Fried’s parameter from a time series of an arbitrary resolved object imaged through atmospheric turbulence
TL;DR: In this paper, a method to obtain an estimate of Fried's seeing parameter r0 from time series of an arbitrarily shaped, resolved structure that exhibits degradation resulting from atmospheric turbulence is presented.
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Astronomical speckle imaging
TL;DR: The many methods suggested and (some of them) tried out experimentally and/or observationally for imaging celestial objects through the Earth's atmosphere are reviewed in this paper, where their theoretical and physical bases are examined.
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Determination of Fried's parameter r 0 prediction for the observed r.m.s. contrast in solar granulation
TL;DR: In this article, the influence of the telescope diameter on solar observations is shown graphically, and predictions for the observed contrast in solar granulation are made as a function of wavelength.
References
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Journal ArticleDOI
Optical Resolution Through a Randomly Inhomogeneous Medium for Very Long and Very Short Exposures
TL;DR: In this article, the average resolution of very-long and very-short-exposure images is studied in terms of the phase and log-amplitude structure functions, whose sum is called the wave-structure function.
Journal Article
Attainment of Diffraction Limited Resolution in Large Telescopes by Fourier Analysing Speckle Patterns in Star Images
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Analysis of a method for obtaining near-diffraction-limited information in the presence of atmospheric turbulence
TL;DR: In this paper, mathematical expressions for the Wiener spectrum of the image of a point source were obtained for angular frequencies much less than, and much greater than, the conventional seeing limit.
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