Venus global radar reflectivity and correlations with elevation

Mathematics – Logic

Scientific paper

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Pioneer Space Probes, Radar Geology, Radar Maps, Venus Radar Echoes, Clumps, Dielectrics, Fresnel Region, Iron Compounds, Reflectance, Regolith, Soils, Titanium Compounds, Venus Surface, Venus, Radar Methods, Reflectivity, Elevation, Surface, Remote Sensing, Pioneer Venus, Orbiters, Pvo, Statistical Analysis, Geology, Comparisons, Topography, Wavelengths, Physical Properties, Roughness, Magnitude, Moon, Mars, Soil, Mantle, Distribution, Porosity, Models, Weathering, Highlands, Lowlands, Parameters

Scientific paper

The global distribution of the reflectivity of the surface of Venus as determined by the Pioneer Venus orbital radar instrument has been analyzed in a geological context and statistically correlated with elevation. In addition, a comparison between the reflectivity and rms slope (roughness) correlations with elevation permits radar-geologic topographic zones to be identified. The radar reflectivity ρ at normal incidence and at a wavelength of 17 cm (1.76 GHz) is a model-dependent measure of the bulk dielectric constant κ of surfaces dominanted by dry rocks and soils and depends on surface material properties such as porosity and conductivity. Only the quasi-specular component of the radar echo was used in determining the reflectivity values analyzed in this study, and for very rough surfaces the absolute magnitude of ρ may be underestimated by 10 - 15%. Empirically derived relationships between ρ, κ, and bulk density γ are used to interpret geologically the ρ distribution.

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