期刊
GEOPHYSICAL RESEARCH LETTERS
卷 27, 期 16, 页码 2449-2452出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2000GL000072
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Techniques developed for the reduction and analysis of terrestrial satellite magnetic field data are used to better understand the magnetic field observations made by Mars Global Surveyor. A global distribution of radial (B-r) magnetic field observations and associated uncertainties is inverted for an equivalent source magnetization distribution and then used to generate an altitude- normalized map of B-r at 200 km. The observations are well-represented by a potential function of crustal origin, consistent with a remanent origin for the Martian magnetic features. The correlation between the 40546 B-r observations and B-r calculated from the magnetization solution at observation locations is 0.978. For a magnetization distribution confined to a 50 km layer, calculated magnetizations range from -22 to +17 A/m. We see correlations with tectonics that were only hinted at in earlier maps. Magnetic features appear to be truncated against Valles Marineris and Ganges Chasma, suggestive of a major change in crustal properties associated with faulting.
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