Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3424203t&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 24, CiteID L24203
Physics
15
Planetary Sciences: Solar System Objects: Planetary Rings, Planetary Sciences: Solar System Objects: Saturn, Electromagnetics: Scattering And Diffraction, Electromagnetics: Wave Propagation (2487, 3285, 4275, 4455, 6934), Radio Science: Remote Sensing
Scientific paper
Diffraction of coherent radio waves transmitted by the Cassini spacecraft at 0.94- and 3.6-cm wavelengths indicates the presence of fine-scale structure in Saturn's rings A and B, characterized by a periodic radial variation in optical depth. Interpretation of the observed spectral signature in terms of a simple diffraction grating model yields estimates of the structural period λ gr ~ 100-250 meters and orientation $\phi$ gr ~ 0. In particular, two regions in Ring A of radial extent 123.05-123.4 × 103 km and 123.6-124.6 × 103 km yield average estimates of ${\overline{\lambda} gr = 163 +/- 6 meters and ${\overline{\lambda} gr = 217 +/- 8 meters, respectively. Three regions in Ring B of radial extent 92.1-92.6 × 103, 99.0-104.5 × 103 km, and 110.0-115.0 × 103 yield average estimates of ${\overline{\lambda} gr = 115-15 +20, 146 +/- 14, and 250-75 +150 meters, respectively. In all regions, the structure appears to be azimuthally symmetric with -3° <= $\phi$ gr <= 3°.
French Richard G.
Marouf Essam A.
Rappoport Nicole J.
Thomson Fraser S.
Tyler Leonard G.
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