Empirical speckle transfer function measurements from partial eclipse observations of the Sun.

Details Empirical speckle transfer function measurements from partial eclipse observations of the Sun. Empirical speckle transfer function measurements from partial eclipse observations of the Sun.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..114..387d&link_type=abstract

Astronomy and Astrophysics Supplement, v.114, p.387

Astronomy and Astrophysics

Astrophysics

12

Techniques: Image Processing, Techniques: Interferometric, Sun: Granulation, Atmospheric: Effects

Scientific paper

Empirical speckle transfer functions are derived from time series obtained during the partial eclipse on May 10, 1994, using the lunar limb as a reference structure. These functions are compared with theoretical transfer functions usually applied to solar data. Moreover, the observations are suitable for testing the spectral ratio method which is often used to estimate the seeing-dependent Fried parameter r_0_. The results indicate that the spectral ratio method overestimates the Fried parameter. The empirical speckle transfer functions exhibit a steeper decrease at spatial frequencies above the seeing-cutoff where speckle methods restore the usually lost image structures. This steeper decrease was taken into account for correcting the theoretical transfer functions. Applications of these new speckle transfer functions to solar data are presented. In comparison with previous reconstructions based on theoretical transfer functions, the sharpness of the reconstructed pictures is significantly increased. Besides, the contrast of solar structures can be estimated more reliably.

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