Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmdi51a..04j&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #DI51A-04
Physics
5734 Magnetic Fields And Magnetism
Scientific paper
The energy source for the geodynamo is believed to be a mixture of compositional and thermal convection operating in the liquid outer core. This process can be simulated using three-dimensional numerical codes that solve the Navier-Stokes equations and the electromagnetic induction equation. The relevant parameter range for planetary dynamos cannot be reached directly, but there is growing evidence suggesting that asymptotic regimes can be obtained, and these can be interpreted in the light of our understanding of rapidly rotating magnetoconvection. If this proves to be the case, plausible extrapolations to the parameter regimes of planetary dynamos can be made. The conditions in some planets appear to be very different from those obtaining in the Earth's core. For example, the ice giants Uranus and Neptune have only much lower ionic electrical conductivities, so we might expect lower magnetic Reynolds numbers. Similarly, the core of Ganymede is much smaller than the Earth's core, again leading to difficulties. We investigate whether it is nevertheless possible for the same driving mechanisms, compositional and thermal convection, to be driving these planetary dynamos.
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