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Venus - Crater distributions at low northern latitudes and in the southern hemisphere from new Arecibo observationsArecibo 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.
Document ID
19900058764
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Campbell, D. B.
(Cornell Univ. Ithaca, NY, United States)
Stacy, N. J. S.
(Cornell Univ. Ithaca, NY, United States)
Hine, A. A.
(Cornell University Ithaca, NY, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Geophysical Research Letters
Volume: 17
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
90A45819
Distribution Limits
Public
Copyright
Other

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