Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgp61a1004s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #GP61A-1004
Physics
1510 Dynamo Theories, 3230 Numerical Solutions, 5734 Magnetic Fields And Magnetism
Scientific paper
In an effort to model the Earth's magnetic field, current numerical dynamo models have produced fields dominated by an axial dipole. In these models, the dynamo is usually generated by convection in a thick, electrically conducting fluid shell surrounding a solid conducting inner core. The Voyager II observations of Uranus (1986) and Neptune (1989) revealed that these planets have non-dipolar, non-axisymmetric magnetic fields, in sharp contrast to the axially dipolar fields of Earth, Jupiter and Saturn. Here we present results of a numerical dynamo model for Uranus and Neptune where the magnetic field is generated in a convecting fluid shell surrounding a stably stratified, electrically conducting fluid interior. This configuration is consistent with current interior models for these planets and has been proposed in the past to help explain their differences in internal heat flows. We find that we can produce magnetic fields with significant higher degree structure and little axial symmetry, similar to those of Uranus and Neptune.
Bloxham Jeremy
Stanley Sabine
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