Mars - VLA observations of the northern hemisphere and the north polar region at wavelengths of 2 and 6 CM

Details Mars - VLA observations of the northern hemisphere and the north polar region at wavelengths of 2 and 6 CM Mars - VLA observations of the northern hemisphere and the north polar region at wavelengths of 2 and 6 CM

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...71..159r&link_type=abstract

Icarus (ISSN 0019-1035), vol. 71, July 1987, p. 159-177.

Astronomy and Astrophysics

Astronomy

51

Astronomical Models, Astronomical Spectroscopy, Centimeter Waves, Mars Atmosphere, Very Large Array (Vla), Brightness Temperature, Carbon Dioxide, Data Acquisition, Mars Surface, Northern Hemisphere, Polar Regions, Mars, Polar Regions, Wavelengths, Earth-Based Observations, Vla Methods, Geometry, Temperature, Remote Sensing, Flux, Density, Procedure, Models, Dielectric Constant, Calculations, Parameters, Longitude, Radio Methods, Latitude, Absorption, Comparisons, Emissions, Techniques, Brightness

Scientific paper

Calculations based on 2- and 6-cm observations of Mars with the A configuration of the VLA have yielded a whole-disk effective dielectric constant of 2.34 + or - 0.05, implying a subsurface density of 1.24 + or - 0.11 g/cu cm at 2 cm, as well as 1.45 + or - 0.10 g/cu cm effective density and 2.70 + or - 0.10 dielectric constant at 6 cm. These parameters have also been estimated as a function of latitude over the 15 deg S - 60 deg N range; subsurface radio absorption length was estimated to be about 15 wavelengths at most of these latitudes. Most of the subsurface density calculations yielded results in the 1-2-g/cu cm range, implying that the subsurface is not very different from the surface observed by Viking and Mariner spacecraft; the decrease in correlation with depth is in keeping with slow variation of the subsurface in the near-subsurface region.

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