Martien magnetic field: What have we learned from the latest missions? What about the upcoming missions?

Details Martien magnetic field: What have we learned from the latest missions? What about the upcoming missions? Martien magnetic field: What have we learned from the latest missions? What about the upcoming missions?

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4050m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4050

Computer Science

Scientific paper

Some of the most recent results on the Martian magnetic field are presented, as the new global maps obtained using all three components of the measured field for the first 28 months of the MGS mission (Langlais et al, 2003). The maps were developed based on partial solutions from low- and high-altitude data sets and the optimal solutions were obtained for dipoles located at a depth of 20 km. A deep source is consistent with the spectra deduced from this new solution, and with previous published spectra (Voorhies et al., 2002, and Cain et al, 2002), which suggest even deeper depths. Magnetization directions were solved for as part of this new solution, and can serve as the basis of future local and global tectonic studies. Finally, the new solution gives strong correlations between relatively small impact craters (300 km diameter) and magnetization contrasts. The strength of the Martian internal field was unexpected, and there is difficulty in explaining it without invoking exotic materials, unusually thick and coherently magnetized bodies, and/or strong dynamo fields. Perhaps what we interpret as a thermal remanent magnetization held in the cool lithosphere of Mars is really a dynamo field that is not working in a regime comparable to the Earth's magnetic field. Some tests of this hypothesis were recently conducted using night-time data from early in the MGS mapping phase (June, 2000), compared with the most recent (May, 2002) night-time data (Purucker et al., 2003). All the present results show that a longer-base line, provided by an orbital magnetometer in the 2009 time frame, would improve the confidence in our knowleadge of Martian magnetic filed. A review of the upcoming missions (approved, under constraction or just proposed) are also presented.

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