Effect of the inner core on the numerical solution of the magnetohydrodynamic dynamo

Details Effect of the inner core on the numerical solution of the magnetohydrodynamic dynamo Effect of the inner core on the numerical solution of the magnetohydrodynamic dynamo

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111..105s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 111, Issue 1-2, p. 105-121.

Physics

55

Scientific paper

We report two simulation results of the magnetohydrodynamic dynamo applied to rapidly rotating spherical systems using fully nonlinear equations under Boussinesq approximation. Calculations were carried out under the same parameter conditions but for a spherical shell and a sphere. We assume that a uniform internal heat source distributed in the whole sphere drives the convection and dynamo and that the physical properties of the inner core are identical to those of the fluid outer core except for its rigidity. This treatment enables us to compare two cases under the same condition, except the existence of the inner core. Magnetic field is effectively generated by strong velocity shear and helicity of the fluid near the top (and bottom) boundaries. A stable axial dipole field develops in the case of the spherical shell because of the steady field generation at both the outer and inner boundaries, while the magnetic field in the sphere fluctuates with time from lack of the bottom boundary before it reaches the dipole dominant state at last. This result suggests that the Earth's magnetic field may be stabilized as the inner core grows, even though the total energy input is the same. This study provides a first step to interpret the paleointensity data from the Archaean when there was a transition due to the growth of the inner core.

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