Statistics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....11535l&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #11535
Statistics
Scientific paper
The Martian magnetic field is characterized by its short spatial length scales and locally high intensity anomalies. The magnetic experiment on-board the Mars Global Surveyor satellite provided a dual altitude coverage, one near 200±100 km (AB and SPO phases), and another one near 400±30 km (MO phase). These datasets are used to model the magnetic field at a constant altitude. Because there is no global, Earth-like, inducing magnetic field, the magnetization directions are solved for as part of the solution. Many a priori parameters can influence the model, among which are the dipole mesh resolution, and the depth to the sources. We present modeling results, showing the evolution of statistics with respect to these a priori parameters. The final model consists of a mesh of 40-km thick dipoles, located 20 km below the surface, on a 170-km mean horizontal resolution grid. A discussion with respect to the residuals is presented. Comparisons with previously published models show that our model is at least equivalent or even better. Nonetheless, the magnetization model gives us an unique opportunity to explore the properties of the Martian lithosphere. Given an assumed 40-km thick magnetized layer, magnetization ranges ± 12 A/m. We also present some strong correlations between relatively small impact craters (>= 300 km diameter) and magnetization contrasts. Finally, we discuss the implications of the directional information and calculated paleopoles.
Langlais Benoit
Mandea Mioara
Purucker Michael
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