Other
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..129g&link_type=abstract
Icarus (ISSN 0019-1035), vol. 62, April 1985, p. 129-142.
Other
3
Gravity Anomalies, Planetary Gravitation, Topography, Venus Surface, Bayes Theorem, Data Reduction, Mass Distribution, Pioneer Venus 1 Spacecraft, Planetary Mass, Spherical Harmonics, Venus, Pioneer Venus, Orbiters, Pvo, Doppler Methods, Anomalies, Depth, Gravity Fields, Beta Regio, Gravity Properties, Topography, Comparisons, Compensation, Spectra, Analysis, Procedure
Scientific paper
Doppler tracking data from the Pioneer Venus Orbiter (PVO) have been used to estimate the anomalous gravity field in the region of Venus west of Beta Regio. The analysis invokes a Kalman filter-smoother to solve the nonlinear spacecraft state estimation problem and a linear Bayesian estimator to perform the geophysical inversion. The topographic map for this region, derived from the PVO radar, has been filtered to have the same distortions and degree of smoothing as the gravity map. The undulations of the gravity are about 0.2 times as large as expected from the topography, on the assumption that the latter is uncompensated. A comparison of the gravity and topography by means of the spectral admittance is consistent with Airy compensation at a depth of 50 km, if the surface material has a density of 2.6 g/cu cm. However, this is not a unique interpretation.
Goldgerb Z. M.
Reasenberg Robert D.
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