Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..695l&link_type=abstract
Nature, vol. 282, Dec. 13, 1979, p. 695, 696.
Astronomy and Astrophysics
Astronomy
8
Astronomical Models, Azimuth, Brightness Temperature, Periodic Variations, Saturn Rings, Albedo, Astronomical Photometry, Limb Darkening, Optical Thickness, Particle Size Distribution, Planetary Gravitation, Saturn, Rings, Brightness, Models, Particles, Shape, Albedo, Density, Gravitational Effects, Photometry, Diagrams, Geometry, Optical Properties, Amplitude, Dynamics
Scientific paper
The paper presents a model to explain brightness variations in Saturn rings. These variations have been interpreted as implying the presence of large, synchronously rotating particles with elongated shapes or leading-trailing-edge differences although such syncronous rotation appears unlikely. The model given here assumes that the gravitational wakes or waves can be considered as elongated distributions of particles referred to as blobs, and the radiative transfer in the rings will involve both processes internal to the blobs and analogous processes among blobs. This model explains the existence of azimuthal variation in ring brightness, as well as the dependence of their amplitude on geometrical and photometric parameters. The probable photometric effects are outlined assuming the existence of density irregularities as a result of self-gravitation, and the results simplfy the geometric discussion of Franklin and Colombo (1978).
Irvine William M.
Lumme Kari
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