Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...85z&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 85-86 (SEE N92-10728 01-91)
Physics
Geophysics
Gravitational Fields, Landforms, Mars Surface, Photogeology, Planetary Geology, Spatial Resolution, Doppler Radar, Gravitation, Mariner Spacecraft, Mariner 9 Space Probe, Radar Tracking, Topography, Viking Mars Program, Viking 1 Spacecraft
Scientific paper
Understanding the origin and evolution of major photographic features on Mars, such as the hemispheric dichotomy and Tharsis rise, will require improved resolution of that planet's gravitational and topographic fields. The highest resolution gravity model for Mars published to date was derived from Doppler tracking data from the Mariner 9 and Viking 1 and 2 spacecraft, and is of 18th degree and order. That field has a maximum spatial resolution of approx. 600 km, which is comparable to that of the best topographic model. The resolution of previous gravity models was limited not by data density, but rather by the computational resources available at the time. Because this restriction is no longer a limitation, the Viking and Mariner data sets were reanalyzed and a gravitational field was derived complete to the 40th degree and order with a corresponding maximum spatial resolution of 300 km where the data permit.
Fricke Susan K.
Lerch F. J.
Nerem Steven R.
Patel G. B.
Smith Douglas E.
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