Computer Science
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sosyr..27..111k&link_type=abstract
Solar System Research, Vol. 27, No. 2, p. 111 - 119
Computer Science
Mars: Gravitational Field
Scientific paper
Maps have been constructed of the areoid heights N and of anomalies of the acceleration of gravity δg from data on the gravitational field of Mars, which are an expansion of its gravitational potential to 50th degree and order, and moreover, they have been referred to its figure of hydrostatic equilibrium. The map of areoid heights is divided into two large diametrically opposite positive anomalies in the equatorial region; the western one is associated with the Tharsis uplift. Smaller scale anomalies have been suppressed by the long wavelength component, and the anomalies of the areoid after removal of the first four harmonics from the expansion of the potential were used to reveal them. Both the large-scale and also the small-scale features of the Martian gravitational field show up most clearly on the map of the anomalies of the acceleration of gravity δg. The large mascon structures Utopia, Isidis, and possibly Hellas are among the interesting features. Larger negative anomalies are noticeable in the northern polar zone than in the southern polar zone, which are connected with the well-known topographic dichotomy of Mars. An annular negative anomaly has been detected around the Olympus Mons shield volcano. An interpretation of the positive anomaly directly above Olympus Mons is considered in this paper, which enabled one to estimate the effective density of the volcanic structure as 1.2 g/cm3. The hypothesis is formulated that Olympus Mons has a broad crustal "root" at the boundary between the crust and mantle, which one may consider as a floating foundation that supports this structure and causes the negative gravitational anomaly on the volcano's periphery.
Koshlyakov E. M.
Zharkov Vladimir Naumovich
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