Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.u4004c&link_type=abstract
American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #U4.004
Astronomy and Astrophysics
Astrophysics
Scientific paper
Dynamo action--the process of magnetic field generation by the motions of an electrically conducting fluids--is often invoked to explain the origin of magnetic fields in stars and planets. In many situations of astrophysical interest, the plasma motions that drive the dynamos are characterised by a large magnetic Reynolds number--the ratio of diffusive to convective timescales-- and a small magnetic Prandtl number--the ratio of viscosity to magnetic diffusivity, implying that that the dynamos operate in highly turbulent environments, where the velocity fluctuates on scales much smalled than the lentgth at which the magnetic diffusion becomes important. These constraint pose significant challenges to the numerical and experimental attempts to model astrophysical dynamos. In this talk I will review the present state of numerical and laboratory dynamo experiments as well as the efforts to extend it towards more realistic astrophysical regimes.
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