Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgp42a..02l&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #GP42A-02
Physics
[1517] Geomagnetism And Paleomagnetism / Magnetic Anomalies: Modeling And Interpretation, [1595] Geomagnetism And Paleomagnetism / Planetary Magnetism: All Frequencies And Wavelengths, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
The Mars Global Surveyor probe stayed in orbit during almost one decade, from Sept. 1997 to Nov. 2006. During its tour, it acquired valuable measurements of the Martian magnetic field at a range of altitudes, using both direct (i.e., involving MAGnetometers) and indirect methods (i.e., using Electron Reflectometry). The MAG dataset consists in a complete and repetitive survey of the three components of the magnetic field at altitudes ranging between 370 and 430 km, with additional sparse measurements at lower altitudes, which were acquired during the initial mission phases. These measurements have an error noise of the order of 1 nT, but they are sensitive to both internal and external contributions. The ER dataset consists in an incomplete and remote coverage of the magnetic field of internal origin, at an altitude of 185 km. This lower altitude (and closer distance to the magnetic sources) and better exclusion of external fields compensates for the lack of vector information, as well as the poorer geographical resolution related to the remote sensing method. In this paper, we present the first combined use of these two datasets into a single magnetization model of the Martian lithosphere. The model aims first at predicting the magnetic field vector of internal origin at low altitude, allowing an easier comparison of the magnetic field of Mars with its geology, with an improved horizontal resolution when compared to previous models which used only one dataset. Second, the model is based on the equidistant Equivalent Source Dipole method, which can be used to estimate what are the lateral variations of the magnetization. The details of this new crustal field map will provide us with a unique opportunity to remotely characterize Mars' interior and evolution, and will yield important information about the inter- connected histories of volcanism, magmatism, impacts and the ancient Martian dynamo.
Langlais Benoit
Lillis Robert J.
Purucker Michael E.
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