Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sva....19..500t&link_type=abstract
(Astronomicheskii Zhurnal, vol. 52, July-Aug. 1975, p. 823-831.) Soviet Astronomy, vol. 19, no. 4, 1976, p. 500-504. Translatio
Astronomy and Astrophysics
Astronomy
2
Astronomical Photometry, Limb Darkening, Planetary Atmospheres, Saturn (Planet), Aerosols, Albedo, Microparticles, Rayleigh Scattering
Scientific paper
Data obtained by photometric measurements of the brightness distribution over Saturn's disk and by absolute measurements of the albedo of the planet's cloud cover are analyzed. It is found that the relationship between the limb-darkening coefficient and the brightness coefficient at the disk's center satisfies theoretical calculations both for very small particles with near-Rayleigh scattering and for particles with an average radius of the order of 1 micron. Only the latter particles are found to give complete agreement with all observations and theoretical considerations. It is shown that the true color differences among Saturn's cloud belts are less than the visual ones due to the difference in pole darkening at long and short wavelengths. The optical thickness of the atmosphere above the clouds suggests that the upper boundary for diffusion of the aerosol component must be located well above the boundary of the convection zone.
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