Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177..265v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 265-276.
Astronomy and Astrophysics
Astrophysics
24
Power Spectra, Solar Atmosphere, Solar Granulation, Speckle Interferometry, Data Reduction, Error Analysis, Image Processing, Spectral Energy Distribution, Transfer Functions
Scientific paper
Granulation was observed with a CCD array at the SPO tower telescope in a quiet region near the solar center. Time series of short exposure (4 ms) pictures of a 14 by 14 arcsec region were taken. Consecutive frames were separated by 0.55 s in time. Labeyrie's (1970) speckle interferometry technique was applied in order to recover power spectra of the intensity fluctuations at high spatial frequencies. The spectral ratio technique (von der Luhe, 1984) was applied to correct for seeing attenaution of the power spectra. It is possible to recover a signal up to spatial frequency of 2.5 line pairs per arcsec, corresponding to a wave number of 22/Mm or 40 percent of the diffraction limit of the telescope under 1.3 arcsec average seeing conditions. A corrected rms granulation contrast of 0.127 + or - 0.01 is estimated, and an exponential falloff of power density toward higher spatial frequencies is observed.
Dunn Richard B.
von der Luhe Oskar
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