Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5505a&link_type=abstract
American Astronomical Society, DPS meeting #30, #55.P05; Bulletin of the American Astronomical Society, Vol. 30, p.1448
Other
Scientific paper
Slopes, slope distributions, and macroscale surface roughness in the northern hemisphere of Mars have been measured from topographic profiles collected by the Mars Orbiter Laser Altimeter (MOLA) in the capture orbit, aerobraking hiatus and Science Phasing Orbit phases of the Mars Global Surveyor mission. The distribution function of slopes indicates that portions of the Martian surface fall into statistically distinct categories, distinguished by the histograms of both point-to-point slopes and of longer wavelength (10 and 100 km) slopes. Roughness correlates with elevation such that low regions tend to exhibit low roughness. Areas such as southern hemisphere highlands, dichotomy boundary terrains, and northern hemisphere lowlands all posses unique slope distribution signatures. The slope distribution within the Amazonis Planitia region, particularly member 3 of the Arcadia formation, displays an unusually smooth character. This region of anomalously low thermal inertia and low radar backscatter cross-section exhibits an rms variation in topography of <2 m over a 100-km baseline. Previous interpretations have suggested that this area is composed of accumulation of fine dust. Statistical comparison with other planetary surfaces of varying origin indicates that Amazonis most closely resembles in its smoothness the heavily sedimented surfaces on the Earth, i.e. oceanic abyssal plains and basins characterized by fluvial deposition. The smoothest measured volcanic surfaces as measured by altimetry on the Moon, Venus, and Mars are all significantly rougher than Amazonis. Saharan sand sheets are rougher by a factor of about three. Other regions in the Martian northern hemisphere that exhibit clear evidence of aeolian deposition are rougher than Amazonis as well.
Aharonson Oded
Zuber Maria T.
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