Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf...13a&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.13
Physics
Scientific paper
The hemispheric dichotomy in the crustal magnetic field of Mars may indicate that the planet's past dynamo was influenced by a degree-1 heterogeneity on the outer boundary of its liquid metallic convecting core. Here we use numerical dynamos driven by purely volumetric internal heating with imposed degree-1 heat flux heterogeneities to study mantle control on the past dynamo of Mars. We quantify both south-north and east-west magnetic field dichotomies from time-average properties that are calculated according to two different end member crust formation scenarios. Our results indicate that a moderate heat flux anomaly may have been sufficient for obtaining the observed dichotomy. Because of the excitation of a strong equatorial upwelling in the dynamo, the efficiency of a mantle heterogeneity centered at the geographical pole in producing a south-north dichotomy is much higher than that of an heterogeneity centered at the equator in producing an east-west dichotomy. These results argue against a significant True Polar Wander event with major planet re-orientation after the cessation of the dynamo. EPSC Abstracts Vol. 6, EPSC-DPS2011-13, 2011 EPSC-DPS Joint Meeting 2011 c Author(s) 2011
Amit Hagay
Christensen Ulrich R.
Langlais Benoit
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