Venus - Crater distributions at low northern latitudes and in the southern hemisphere from new Arecibo observations

Details Venus - Crater distributions at low northern latitudes and in the southern hemisphere from new Arecibo observations Venus - Crater distributions at low northern latitudes and in the southern hemisphere from new Arecibo observations

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1389c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Aug. 1990, p. 1389-1392. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

15

Craters, Radar Imagery, Venera Satellites, Venus Surface, Meteorite Craters, Radar Astronomy, Tectonics, Topography

Scientific paper

Arecibo high resolution radar data covering approximately 23 percent of the surface of Venus were analyzed for circular features with crater-like appearances. Overlapping Venera 15/16 radar data, with its more normal to the surface viewing geometry, was used to verify crater diameters measured from the Arecibo data. A comparison of the diameter-frequency distribution of the possible impact features in the Arecibo data for northern latitudes south of 40 deg N and for the southern hemisphere with the distribution from the Venera 15/16 data for the northernmost quarter of the planet indicated similar distributions for large crater-like features with diameters greater than approximately 30 km, but a deficiency of smaller craters in the Arecibo data. One possible process responsible for the density differences of small craters is a difference in the rate of volcanic resurfacing. An increase in the resurfacing rate of approximately 50 percent would explain the lower density of small craters in the area covered by the Arecibo data compared with the Venera data, but would not account for the differences being confined to the less than 30 km crater diameter range.

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