VLA Observations of Saturn's Rings at Saturnian Equinox

Details VLA Observations of Saturn's Rings at Saturnian Equinox VLA Observations of Saturn's Rings at Saturnian Equinox

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1804d&link_type=abstract

American Astronomical Society, DPS meeting #28, #18.04; Bulletin of the American Astronomical Society, Vol. 28, p.1124

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Detailed, high resolution observations of Saturns rings have previously been made at 2 and 6 cm wavelength and at a ring inclination angle of 25deg by A. W. Grossman, D. O. Muhleman, & G. L. Berge (1989, Science, 245, 1211). We have observed Saturn during the Saturnian equinox at 0.7, 2.0, 3.6, & 6 cm wavelength and at a ring inclination angle of 2.7deg . This angle is unusally high for a Saturnian equinox, and therefore favorable for detection. We plan to observe Saturn next January when the ring inclination angle will again be similar, but the solar angle will be 6deg in order to empirically distinguish between effects due to scattering and those due to variations in ring particle temperature. We present the brightness temperature (T_B) as a function of ring azimuth and of ring component (A, B, C rings and Cassini Division). As expected the average T_B's have changed since the observation of Grossman, Muhleman, & Berge (1989). We also find unanticipated east-west asymmetries in some portions of the rings. We interpret the changed T_B's in terms of the varying projected optical depths. We consider asymmetric multiple scattering by particles clustered in tilted wakes (e.g., H. Salo 1995, Icarus, 117, 287) as an origin of the east-west asymmetry.

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