Low-emissivity impact craters on Venus

Details Low-emissivity impact craters on Venus Low-emissivity impact craters on Venus

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789..129w&link_type=abstract

In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 129-131 (SEE N93-14288 04-91)

Mathematics

Logic

Backscattering, Emissivity, Meteorite Craters, Radar Imagery, Venus (Planet), Venus Surface, Mineralogy, Radar Data, Scattering Cross Sections, Synthetic Aperture Radar

Scientific paper

An analysis of 144 impact craters on Venus has shown that 11 of these have floors with average emissivities lower than 0.8. The remaining craters have emissivities between 0.8 and 0.9, independent of the specific backscatter cross section of the crater floors. These 144 impact craters were chosen from a possible 164 craters with diameters greater than 30 km as identified by researchers for 89 percent of the surface of Venus. We have only looked at craters below 6053.5 km altitude because a mineralogical change causes high reflectivity/low emissivity above the altitude. We have also excluded all craters with diameters smaller than 30 km because the emissivity footprint at periapsis is 16 x 24 km and becomes larger at the poles.

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