Venus gravity west of Beta Regio

High‐resolution gravity model of Venus

“…These accelerations are processed by our linear inverter in the same way as the spacecraft Doppler rate residuals, yielding, respectively, the smoothed topography and gravity models. As shown by Goldberg and Reasenberg [1985], the resulting gravity model is of high fidelity; its location-dependent resolution and limited distortions are both well mimicked by the corresponding smoothed topography.…”

“…The cell is divided into four (i.e., 2 x 2) "subcells," and the field of each subcell is modeled as the sum of a centered point mass and quadrupole; the dipole term is neglected. As discussed by Goldberg and Reasenberg [1985], the data inversion is performed by a linear Bayesian least squares estimator in which we use the weighted Jekeli covariance to form an a priori covariance matrix. We set a 500-parameter limit to the inversions, which permits a region covering about 60 ø of longitude.…”

“…With the possible exception of the planetary mass estimate, these studies are superseded by the analyses of PVO data. In addition to the studies of local features by Phillips et al [1979], $jogren et al [1980,1983,1984], Reasenberg et al [1981Reasenberg et al [ , 1982, and Goldberg and Reasenberg [1985], there have been evaluations of the low-order spherical harmonic components of the field by Ananda et al [1980], Williams et al [1983], and Mottinger et al [1985] and a determination of an eighteenth degree and order spherical harmonic model by Bills et al [1987]. The gravity model presented here provides the highest resolution yet available, and the companion topography model, which mimics the resolution of the gravity model, provides a convenient means of forming and checking geophysical hypotheses.…”

“…The geophysical inversion performed in the second stage is described by Goldberg and Reasenberg [1985], who also This paper is not subject to U.S. copyright. Published in 1992 by the American Geophysical Union.…”

Planetary geodesy

“…Harmonic analyses of the PVO gravity data have revealed the structure of the Venusian gravity field with increasing fidelity and resolution [Williams et al, 1983;Mottinger et al 1985; Bills et al, manuscript in preparation] while local to regional scale studies have further elucidated the fine structure [Sjogren et al, , 1984Reasenberg et al, 1981Reasenberg et al, , 1982Goldberg and Reasenberg, 1985;Janle and Jannsen, 1984;Bowin, 1983;Bowin et al, 1985]. A notable difference between the earth and Venus concerns the degree of correlation between gravity and topography.…”