An altitude-normalized magnetic map of Mars and its interpretation

Details An altitude-normalized magnetic map of Mars and its interpretation An altitude-normalized magnetic map of Mars and its interpretation

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2449p&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 16, p. 2449-2452

Physics

91

Geomagnetism And Paleomagnetism: Spatial Variations (All Harmonics And Anomalies), Planetology: Solid Surface Planets: Magnetic Fields And Magnetism, Planetology: Solid Surface Planets: Tectonics

Scientific paper

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 (Br) magnetic field observations and associated uncertainties is inverted for an equivalent source magnetization distribution and then used to generate an altitude-normalized map of Br 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 Br observations and Br 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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