Bibcode
Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 661-672.
Advertised on:
10
1992
Citations
18
Refereed citations
14
Description
The paper analyzes white-light images of solar granulation taken outside
active regions, at regular intervals along the polar axis and the
equator, in order to study its center-to-limb variation and possible
changes with the solar latitude. The 2D spatial power spectra of the
brightness distribution are calculated and corrected for the distortions
produced by the atmosphere and the telescope. One-dimensional integrated
spectra are obtained for each position, with the geometrical
foreshortening effect taken into account. A lower contrast, a smaller
mean wavenumber, and a steeper center-to-limb variation of the contrast
are found in the central meridian as compared to the equator. Sources of
error are discussed, and different scenarios are presented in order to
interpret these observational facts. Intensity fluctuations were
detected until the extreme limb, with a spatial scale of about 10
arcsec.