Surface properties of the Pettit wind streak on Mars Implications for sediment transport

Details Surface properties of the Pettit wind streak on Mars Implications for sediment transport Surface properties of the Pettit wind streak on Mars Implications for sediment transport

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66...83z&link_type=abstract

Icarus (ISSN 0019-1035), vol. 66, April 1986, p. 83-93.

Computer Science

13

Image Analysis, Mars Craters, Satellite Imagery, Sediment Transport, Wind Effects, Mars Atmosphere, Mars Surface, Mars, Surface, Streaks, Features, Sediments, Transport, Pettit, Grains, Albedo, Thermal Properties, Inertia, Size, Diameter, Comparisons, Sand, Wind, Temperature, Models, Saltation

Scientific paper

Satellite imagery of the Pettit streak on Amazonis Planitia are discussed in terms of the details of wind streaks and their associated sediments. Increasingly more detailed blow-ups of the available imagery demonstrate that the Pettit streak holds both a Type I bright streak (at the crater rim) and a Type II dark streak beginning at the dark patch within the crater. The lowest albedos measured, 0.20-0.22, are associated with the highest thermal inertia, indicative of grain diameters similar to medium sand, i.e., ranging from 250-350 microns. The brightest portions of the streak have albedos over 0.26 and a low thermal inertia, in the range 3-4, which implies the presence of fine-grained sand, diameters from 50-100 microns. The particle grains are less than 50 microns diameter in the surrounding plains, which have an approximately uniform albedo (0.27) and a thermal inertia of 2.5, characteristics typical of silt or clay. Current streak models describe the dark streak well, but do not account for the bright streak, which may be optically thick patches of very fine dust.

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