Venus: Surface dielectric properties

Details Venus: Surface dielectric properties Venus: Surface dielectric properties

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991esasp.328...45p&link_type=abstract

In ESA, Radars and Lidars in Earth and Planetary Sciences p 45-48 (SEE N92-25668 16-32)

Other

Dielectrics, Permittivity, Surface Layers, Surface Properties, Venus (Planet), Venus Surface, Magellan Spacecraft (Nasa), Radiometric Resolution, Research And Development, Spaceborne Experiments

Scientific paper

Observations of radiothermal emission, radar reflectivity, made both from the Earth and from Venus orbiting spacecraft, have disclosed localized areas of high effective dielectric permittivity on the surface of Venus. In parts of Maxwell Mons and in some highland portions of Aphrodite Terra, the 12 cm wavelength surface radioemissivity drops to values as low as 0.30, accompanied by a radar power reflection coefficient approaching 0.65. These internally consistent but unusual results imply an effective dielectric permittivity in excess of 80, a value which stands in contrast to approximately 5 for most lowland regions of Venus. In the absence of liquid water (known not to exist on the hot surface of Venus), such high values of permittivity are unexpected, and most likely arise from the presence of small, electrically conducting inclusions in a host dielectric, producing a loaded dielectric.

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