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- W2086944034 abstract "Radio occultation observations of Saturn's rings with Voyager 1 provided independent measurements of complex (amplitude and phase) microwave extinction and near-forward scattering cross section of the rings at wavelengths (λ) of 3.6 and 13 cm. The ring opening was 5.9°. The normal microwave opacities, τ[3.6] and τ[13], provide a measure of the total cross-sectional area of particles larger than about 1 and 4 cm radius, respectively. Ring C exhibits gently undulating (∼ 1000 km) structure of normal opacity τ[3.6] ≲ 0.25 except for several narrow imbedded ringlets of less than about 100 km width and τ[3.6] ∼ 0.5 to 1.0. The normalized differential opacity Δτ/τ[3.6], where Δτ = τ[3.6] − τ[13], is about 0.3 over most of ring C, indicating a substantial fraction of centimeter-size particles. Some narrow imbedded ringlets show marked increases in Δτ/τ[3.6] near their edges, implying an enhancement in the relative population of centimeter-size and smaller particles at those locations. In the Cassini division, several sharply defined gaps separate regions of opacity τ ∼ 0.08 and τ ∼ 0.25; the opacity in the Cassini Division appears to be nearly independent of λ. The boundary features at the outer edges of ring C and the Cassini Division are remarkably similar in width and opacity profile, suggesting a similar dynamical control. Ring A appears to be nearly homogeneous over much of its width with 0.6 < τ[3.6] < 0.8 but with considerable thickening, to τ[3.6] ∼ 1.0, near its inner boundary with the Cassini division. Normalized differential opacity decreases from ∼0.3 at the inner and outer edges of ring A to Δτ/τ[3.6] ∼ 0 at a point about one-third of the distance from the inner edge to the outer. The inner one-fourth of ring B has τ[3.6] ∼ 1.0, except very near the boundary with ring C, where it is greater. The outer three-fourths of ring B has τ[3.6] ⪞ 1.2. The differential opacity for the inner one-fourth of ring B is Δτ/τ[3.6] ∼ 0.15. There are no gaps in ring B exceeding about 2 km in width. Ring F was observed at 3.6 cm as a single ringlet of radial width ⪝ 2 km, but was not detected in 13 cm data." @default.
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- W2086944034 date "1983-05-01" @default.
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- W2086944034 title "The microwave opacity of Saturn's rings at wavelengths of 3.6 and 13 cm from Voyager 1 radio occultation" @default.
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- W2086944034 doi "https://doi.org/10.1016/0019-1035(83)90191-4" @default.
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