Statistics – Computation
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.u42b..01o&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #U42B-01
Statistics
Computation
1507 Core Processes (8115), 1510 Dynamo Theories
Scientific paper
The current generation of numerical dynamo models powered by convection in rotating, electrically conducting fluid spheres now reach magnetic Reynolds numbers of several hundred, comparable to the geodynamo. They qualitatively reproduce many of the important characteristics of the geomagnetic field, including axial dipole dominated main fields, strong radial flux concentrations at high latitudes, low flux over the poles, secular variation with westward drift, and occasional polarity reversals. However current numerical dynamos are not scale models of planetary dynamos because τ , the ratio of long time scale (measured by the dipole diffusion time) to short timescale (measured by the length of day), is too small. In numerical dynamo models τ ~= 5*E4 whereas in the Earth's core τ ~= 5*E6. An increase in computational speed by a factor 104 would provide at least one order of magnitude increase in τ , with full spatial resolution. This would place numerical dynamos on the threshold of scale similarity with the geodynamo, and also with dynamos in the other terrestrial planets.
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