The swarm model for the azimuthal brightness variations in Saturn's ring A

Details The swarm model for the azimuthal brightness variations in Saturn's ring A The swarm model for the azimuthal brightness variations in Saturn's ring A

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........3t&link_type=abstract

Ph.D. Thesis Massachusetts Univ., Amherst.

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1

Brightness, Saturn Rings, Variations, Astronomical Photometry, Azimuth, Backscattering, Gravitational Effects, Monte Carlo Method, Optical Thickness, Particles, Space Observations (From Earth)

Scientific paper

A number of researchers have observed asymmetric azimuthal variations in Saturn's ring A not seen in any other portion of the rings. In order to explore this effect, photometric observations of the ring system at for ring tilts, four colors and a range of phase angles, are presented and analyzed. These images are calibrated, converted in ring plane coordinates, and corrected for smearing. The azimuthal effect appears to reach a maximum 40% peak-to-peak variation at a tilt angle near B = s11.5 deg, with a minimum rightness occurring at an orbital phase angle of theta0 = 66 deg + or 2 deg. Phase curves for the rings, and major axis ring profiles are also presented. The azimuthal variations are modelled by ellipsoidal swarms caused gravitational interactions between ring particles. Monte Carlo routines are developed to handle the light scattering properties of triaxial ellipsoids, both for surface (e.g., asteroidal) scattering, and interior scattering. The contribution of backscattered light from the swarms, and from an interswarm medium are separated, and model ellipsoids are compared to the data.

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