The Dynamo's Sensitivity to Core-Mantle Thermal Interactions: Investigations of Mars and Earth (Invited)

Details The Dynamo's Sensitivity to Core-Mantle Thermal Interactions: Investigations of Mars and Earth (Invited) The Dynamo's Sensitivity to Core-Mantle Thermal Interactions: Investigations of Mars and Earth (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmmr22c..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #MR22C-08

Physics

[1213] Geodesy And Gravity / Earth'S Interior: Dynamics, [1507] Geomagnetism And Paleomagnetism / Core Processes, [1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

Various mechanisms can generate lateral thermal variations at the core-mantle boundary (CMB) in terrestrial planets. For example on early Mars, a giant impact, magma ocean overturn, mantle viscosity variations or phase changes have been invoked to explain the hemispheric crustal dichotomy. These mechanisms would have resulted in episodes of hemispheric scale heat flux variations at the CMB. On Earth, plate tectonics governs the thermal variations at the CMB. Previous work has investigated the effects of CMB thermal variations on the core dynamo and resulting magnetic field for both Earth and Mars. The sensitivity can be dramatic, as in a single hemisphere dynamo or cessation of the dynamo in Mars, or more subtle, as in the locking of flux spots and prescribing intensities in the paleomagnetic power spectrum in Earth. Here we use dynamo models to investigate the sensitivity of the dynamo to core-mantle thermal interactions. We examine both the morphology and intensity of core-mantle thermal variations in order to place constraints on interior processes in both Mars and Earth.

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