Venus topography - A harmonic analysis

Details Venus topography - A harmonic analysis Venus topography - A harmonic analysis

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..827b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 10, 1985, p. 827-836. NASA-supported research.

Astronomy and Astrophysics

Astronomy

47

Harmonic Analysis, Topography, Venus Surface, Altimeters, Astronomical Photography, Covariance, Legendre Functions, Pioneer Venus 1 Spacecraft, Spherical Harmonics, Venus, Topography, Harmonics, Analysis, Models, Pioneer Venus, Pvo, Orbiters, Radar Observations, Altimetry, Radius, Density, Comparisons, Gravity Properties, Spectra, Geomorphology

Scientific paper

A model of Venusian global topography has been obtained by fitting an eighteenth-degree harmonic series to Pioneer Venus orbiter radar altimeter data. The mean radius is (6051.45 + or - 0.04) km. The corresponding mean density is (5244.8 + or 0.5) kg/cu m. The center of figure is displaced from the center of mass by (0.339 + or - 0.088) km towards (6.6 + or 10.1) deg N, (148. 8 + or - 7.7) deg. The figure of Venus is distinctly triaxial, but the orientation and magnitudes of the principal topographic axes correlate rather poorly with the gravitational principal axes. However, the higher-degree harmonics of topography and gravity are significantly correlated. The topographic variance spectrum of Venus is very similar in form to those of the moon, Mars, and especially earth. It is suggested that this spectral similarity simply reflects a statistical balance between constructional and degradational geomorphic proceses. Venus and earth are particularly similar (and differ from the moon and Mars) in that the larger bodies both exhibit a significant low degree deficit (relative to the extrapolated trend of the higher harmonics).

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