Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p42a0538t&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P42A-0538
Physics
6225 Mars, 8149 Planetary Tectonics (5475), 8450 Planetary Volcanism (5480)
Scientific paper
The magnetic field of a planet may result from two primary sources, convection in a conductive liquid core and the interaction between the planet and solar wind plasma, and from two secondary sources, the local magnetisation of crustal and lithospheric rocks and electric currents induced in the planet by the transient magnetic fields of external origin. The external natural fluctuations (the primary source) of the magnetic field induce an internal response (the secondary source) that can be used to infer the electrical conductivity structure of the planet. The maximum depth resolved by the technique is a function of the longest period of variations of the external magnetic sources that may be recovered from the data. The external transient variations result from both the interactions between the planetary environment and the solar wind plasma. Several studies on Earth, both theoretical and with current available satellite data, have shown that the secondary induced field may be recovered from the satellite magnetic data and that electrical conductivity may be derived from them. These studies also emphasise the advantage to have simultaneously the time and spatially changing magnetic field from satellite and land stations with continuous time series. There is therefore a great interest to apply a similar approach for the Mars exploration. MGS provides the vector magnetic field and offers the unique opportunity to investigate at planetary scale the Mars mantle electrical conductivity. This parameter depends strongly on the temperature, partial melting, fluid phase as well as on the mineralogy and may provide strong constraints upon the mantle structure. One of the difficulties is the limited data about the primary field. When the satellite is beneath the sources, it is theoretically possible to separate the secondary induced field from the primary inducing field. Nevertheless, with satellite magnetic data, it seems more efficient to model both fields at the same time.
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