Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.g43a0801b&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #G43A-0801
Physics
5417 Gravitational Fields (1227), 6225 Mars, 1219 Local Gravity Anomalies And Crustal Structure, 1227 Planetary Geodesy And Gravity (5420, 5714, 6019)
Scientific paper
Planetary gravity fields can be studied in detail by measuring their effect on the velocity of an orbiting probe. Two main methods of analysis of the resulting Doppler data are available. Either a complete dynamical modeling of the probe orbit yields a global spherical harmonic gravity field, or a local analysis of the residual Doppler data leads to a model of the gravity field in a given area. The very elliptical orbit of Mars Express favors the second method, since only measurements near pericenter include a significant contribution from underlying gravity anomalies. The residual line-of-sight Doppler data provided by the MaRS experiment are inverted with a Tarantola-Valette stochastic procedure, with a priori knowledge of the solution given by a full correlation matrix constrained by the Kaula rule. As a result, the Doppler data are mapped as gravity disturbances on a sphere close to the planetary surface. Mars Express gravity data are expected to be especially useful for the study of polar caps, where the gravity field is not well known at the present.
Barriot J.
Beuthe Mikael
Pätzold Martin
Rosenblatt Pascal
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