The spectrophotometric gradients and spectral variations of the albedo and limb darkening coefficient on Saturn's disk

Details The spectrophotometric gradients and spectral variations of the albedo and limb darkening coefficient on Saturn's disk The spectrophotometric gradients and spectral variations of the albedo and limb darkening coefficient on Saturn's disk

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993avest..27...20t&link_type=abstract

Astronomicheskii Vestnik (ISSN 0320-930X), vol. 27, no. 3, p. 20-29

Astronomy and Astrophysics

Astronomy

Albedo, Gradients, Limb Darkening, Saturn (Planet), Scattering Coefficients, Spectral Energy Distribution, Spectrophotometry, Cloud Cover, Optical Thickness, Rayleigh Scattering, Spectrograms, Spectrum Analysis

Scientific paper

From the computerized analysis of the photometric reduction of the spectrograms of the central meridian and the intensity equator of Saturn obtained in 1979, 1988, and 1991, the spectrophotometric gradients relative to the Sun's spectral energy distribution were determined on different latitudes of the planet. The spectral gradients at 430-530 nm G1 and 540-640 nm G2 are significantly different and their difference depends on the latitude. The value of G2 - G1 is systematically smaller in the equatorial zone of Saturn compared with the temperate belts and shows some temporal variations. A probable reason for these differences may be the latitudinal variations of the optical depth of the atmosphere with Rayleigh scattering over the cloud deck: the clouds lie deeper at the temperate latitudes and higher in the equatorial zone. Some peculiarities in the spectral reflectivity on temperate latitudes are noted in 1991. The wavelength dependence of the limb darkening coefficient Kd for the Equatorial Zone has also been derived from the measurements of the spectrograms after necessary reduction to take into account the tilt of Saturn's equator and seeing conditions. The relation between Kd and I/F confirms the preceding conclusion about the small asymmetry of the scattering function in the clouds or haze and significant back scattering of the cloud particles.

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