Multiwavelength Radio Observations of Saturn's Rings at Low Inclinations
Dunn, D. E. (U. Iowa), Molnar, L. A. (U. Iowa), Fix, J. D. (U. Iowa)
We present final brightness temperature maps of Saturn as observed at
its equinox (20 November 1995) with the Very Large Array at 0.7, 2.0,
3.6, and 6.1 cm wavelength. The ring inclination angle was 
. The western ansa was brighter than the eastern one at every
wavelength, an effect seen by de Pater and Dickel (1991) at higher
inclinations. The asymmetry cannot be understood in terms of a single
particle scattering phase function which should be mirror symmetric on
average. We suggest instead the effect is caused by multiple
scattering in an anisotropic particle distribution, such as a
gravitational wake.
We also present preliminary brightness temperature maps of Saturn at a
second epoch, February 1997, at 1.3, 2.0, 3.6, 6.1, 18, and 20 cm
wavelength. The ring inclination angle was 
. The data at
this epoch have a higher sensitivity and finer resolution than the
earlier data, in addition to havin a more uniform spatial coverage.