Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..277v&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. 277-283.
Astronomy and Astrophysics
Astrophysics
3
Fourier Transformation, Optical Data Processing, Solar Granulation, Digital Techniques, Microdensitometers, Power Spectra, Radiant Flux Density, Wavelengths
Scientific paper
The application of an optical Fourier transformation setup to solar granulation transparencies is examined. An analysis of the photographic process makes it possible to derive calibrated radial power spectra of the granulation intensity fluctuations. The results are compared with power spectra of the same pictures obtained via microdensitometry and fast Fourier algorithms. It is found that the two independent methods lead to essentially the same quantitative results in the medium to high spatial wavenumber regions (2.5 to 10 per Mm). Disturbances due to the film supporting the granulation transmission pattern do not permit any significant optical power density estimates in the lower wavenumber regions (below 2.5 per Mm). It is concluded, however, that optical Fourier transformation, may be a useful alternative to other techniques in this field.
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