Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...36..153s&link_type=abstract
Icarus, vol. 36, Nov. 1978, p. 153-173.
Astronomy and Astrophysics
Astronomy
2
Landing Sites, Mars Surface, Radar Astronomy, Radar Echoes, Topography, Northern Hemisphere, Power Spectra, Radio Telescopes, Specular Reflection, Surface Roughness, Viking Mars Program, Viking 1, Landing Sites, Viking Orbiter, Imagery, Albor Tholus, Radar Echoes, Chryse, Planitia, Mariner 9, Roughness, Morphology, Volcanism, Elysium Planitia, Scattering, Mars, Surface, Radar, Observations, Mapping, Spectrum, Characteristics
Scientific paper
Mars surface characteristics at and near the Viking Chryse and Tritonis Lacus landing areas were determined by radio scatter using the 12.6-cm radar at the Arecibo Observatory during 1975-76. Interpretation of each power spectrum suggests rms surface tilts of 4 deg at the final A1WNW (47.9 deg W, 22.5 deg N) site, 5 deg near the original A1 site, and 6 deg between the two. At the back-up site (A2) surface-roughness estimates were about 4 deg. Striking changes in surface texture have been found near the eastern bases of Tharsis Montes and Albor Tholus, each volcanic feature marking the western boundary of very smooth surface units. The roughness sensed at 1- to 100-m scales by radar appears to be relatively independent of the surface units defined at large scale lengths by photogeologists. Radar properties thus provide an additional means by which planetary surfaces may be characterized.
Campbell Don B.
Simpson Richard A.
Tyler Leonard G.
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