From stable dipolar towards reversing numerical dynamos

Details From stable dipolar towards reversing numerical dynamos From stable dipolar towards reversing numerical dynamos

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..131...29k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 131, Issue 1, p. 29-45.

Physics

69

Scientific paper

We are using a three-dimensional convection-driven numerical dynamo model without hyperdiffusivity to study the characteristic structure and time variability of the magnetic field in dependence of the Rayleigh number (/Ra) for values up to 40 times supercritical. We also compare a variety of ways to drive the convection and basically find two dynamo regimes. At low /Ra, the magnetic field at the surface of the model is dominated by the non-reversing axial dipole component. At high /Ra, the dipole part becomes small in comparison to higher multipole components. At transitional values of /Ra, the dynamo vacillates between the dipole-dominated and the multipolar regime, which includes excursions and reversals of the dipole axis. We discuss, in particular, one model of chemically driven convection, where for a suitable value of /Ra, the mean dipole moment and the temporal evolution of the magnetic field resemble the known properties of the Earth's field from paleomagnetic data.

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