Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept...99p&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 99-100 (SEE N85-23474 13-91)
Astronomy and Astrophysics
Astronomy
Brightness Temperature, High Resolution, Radar Imagery, Radio Astronomy, Surface Properties, Venus (Planet), Venus Surface, Dielectrics, Pioneer Venus 1 Spacecraft, Polarization Characteristics, Reflectance, Thermal Emission
Scientific paper
Three different radio techniques were used to study the electrical properties of the surface of Venus. The reflectivity of the surface at near normal incidence was studied using radar from the Pioneer Venus Orbiter (PVO) spacecraft. These measurements have inferred the corresponding dielectric constants. Surface emissivities were calculated using measurements of thermal emission brightness temperature obtained both from spacecraft and from the ground. These measurements also have inferred dielectric constant. The degree of linear polarization associated with thermal energy emitted from the surface at various angles was examined. The dielectric constant was calculated. The radar data have provided the highest surface resolution of the three techniques, and were the first to show the unusually high values of Fresnel reflection coefficient (approaching 0.40 in extreme cases) that are associated with many of the elevated regions of Venus. The distribution of small scale surface roughness was estimated.
Chapman B. M.
Ford Peter G.
Pettengill Gordon H.
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