Observed Temporal Variations in the Low Degree Gravity Field of Mars

Details Observed Temporal Variations in the Low Degree Gravity Field of Mars Observed Temporal Variations in the Low Degree Gravity Field of Mars

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32e..11s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P32E-11

Physics

5417 Gravitational Fields (1227), 6225 Mars

Scientific paper

Changes in the zonal harmonics of Mars' gravity field have been detected in the tracking data of the Mars Global Surveyor spacecraft. The tracking data extend over one Mars year and suggest annual and seasonal changes that appear linked to the seasonal cycle of atmospheric changes on Mars, in particular the deposition of CO2 on the winter polar caps and its subsequent sublimation back into the atmosphere. The time variations in the zonal gravity coefficients represent a lumped effect from many coefficients and their individual interpretation and comparison with atmospheric models is complicated by the high correlations between the coefficients but does permit an estimate of the seasonal mass transfer between the atmosphere and the regolith. In addition, the small solar tide k2 has been detected in the data and is consistent with a planet of high overall internal strength.

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