Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7005b&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7005
Mathematics
Logic
Scientific paper
The radar-dark diffuse crater-related features on Venus are thought to be formed by impact-generated mantles of loose material. Characteristics of these mantles were studied using a simple model for radiophysical properties. According to the model, the surface is considered as a halfspace of material representing the substrate covered by a uniform mantle; the space-mantle interface is flat, the Kirchhoff approximation is used for wave scattering at the rough mantle - substrate interface. Model calculations show that the presence of the mantle changes the radar cross-section and emissivity. Surroundings of 91 craters with dark diffuse features in 30 - 80 km range of diameters were studied. Preliminary estimates of mantle thickness for these craters were made with the model using the observed emissivity and radar coess-section. Results were analysis for 6 groups of craters with diameters 30 - 35 km, 35 -40 km, 40 -50 km, 50 -60 km, 60 -70 km, and 70 -80 km. Narrow range of diameters in each group allows dealing with the similar ejecta volumes which is important for tracing the evolution of dark diffuse features. In each group, the craters with prominent radar-dark parabolas are characterized by the thickest mantles (up to 10 - 15 m). The mantle is thinner for the craters with a distinctive radar-dark halo, and very thin (lower then 1 m) for the craters with faint dark halo. This result is consistent with that the dark diffuse features change their form with geological time and disappear due to aeolian removal of the loose material of the mantles.
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