Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p31a..03a&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P31A-03
Physics
5440 Magnetic Fields And Magnetism, 5464 Remote Sensing, 5475 Tectonics (8149), 5499 General Or Miscellaneous
Scientific paper
The tangential components of the magnetic field of Mars measured by Mars Global Surveyor (MGS) have appreciable contributions from the external magnetic field than the radial component. The immense amount of data acquired during the mapping phase of MGS provides good opportunity to derive a more accurate model of the magnetic potential field of the Martian crust using only the least contaminated radial component data. For this purpose the radial component data measured since the satellite resumed its mapping phase are divided into 2 sets of data, acquired from March 1999 to February 2001, and from February 2001 to April 2003. Each set is expanded in spherical harmonics using harmonics of degree up to 65, and their most repeatable signatures are selected through covariance analysis. The model tangential components derived from the model potential field are significantly different from those of the observed ones. Not only their small-scale features are different, but also their global scale features specified by spherical harmonics of degree 1-3 show appreciable differences, indicating the global scale external magnetic field contribution. Although the external field has negligible contribution to the strong anomalies of the south hemisphere, it may have appreciable contribution to the weak magnetic anomalies. The more reliable magnetic field model allows us to downward continue the anomalies to the surface of the planet and better delineate the relationship between the tectonic processes and the magnetic anomalies of Mars. The downward continued maps show numerous small scale magnetic anomalies over the northern lowlands, but no significant anomalies inside the giant impact basins.
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