The reflection properties and surface relief of Venus - Radar surveys at 39-cm wavelength

Details The reflection properties and surface relief of Venus - Radar surveys at 39-cm wavelength The reflection properties and surface relief of Venus - Radar surveys at 39-cm wavelength

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..237a&link_type=abstract

(Astronomicheskii Zhurnal, vol. 57, Mar.-Apr. 1980, p. 237-249.) Soviet Astronomy, vol. 24, Mar.-Apr. 1980, p. 139-146. Transla

Astronomy and Astrophysics

Astronomy

Radar Astronomy, Reflectance, Surface Properties, Venus Surface, Histograms, Space Exploration, Specular Reflection, Venus Radar Echoes

Scientific paper

Venus was observed by radar at a wavelength of 39 cm on 450 occasions in 1972, 1975, and 1977. Data reduction yields the reflection properties (the smoothness parameter C in the Hagfors reflection law, the rms slope angle beta of the surface irregularities, the specular reflection coefficient rho, the dielectric constant epsilon) and height profiles along several tracks across the planetary surface. For the equatorial zone (280-360 longitude and latitude range from -10 deg to +10 deg) the following mean values are estimated: C = 345 plus or minus 97, beta = 3.1 deg plus or minus 0.4 deg, rho = 0.144 plus or minus 0.03, epsilon = 4.1 plus or minus 0.9. These parameters exhibit substantial variations with latitude and longitude of the areas observed. The surface height differential reaches 2 km along features extending for tens of hundreds of kilometers. Comparison of the height profiles obtained for the different tracks at different latitudes indicates that meridionally oriented topographic formations more than 1000 km long occur on Venus. In particular, the profiles near 290 deg longitude and at +6 deg, -3 deg, -8 deg latitude resemble sections of a valley 200 km wide and 2 km deep; near 325 deg longitude the profiles suggest a mountain range 2 km high.

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