Other
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..apr.b7004b&link_type=abstract
American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #B7.004
Other
Scientific paper
The success of the dynamo effect as a mechanism for the generation of galactic magnetic fields relies crucially on the destruction of small-scale magnetic fluctuations. If such fluctuations are not destroyed, they can potentially overwhelm any large-scale magnetic field generated by the dynamo. Reconnection is widely believed to provide a possible mechanism for the destruction and smoothening of small scales, execpt that the standard reconnection models based on resistive magnetohydrodynamics (MHD) yield reconnection rates that are much too slow to be physically interesting. It is proposed that collisionless reconnection, mediated by Hall MHD effects, provide a possible way to resolve the difficulties of resistive MHD reconnection because the reconnection rate in Hall MHD is, at leading order, independent of the mechanism that breaks field lines and is hence, independent of resistivity. Electrons and ions are decoupled from each other in Hall MHD, with the consequence that the current density in the reconnection layer is carried mostly by electrons while ions control the reconnection rate. Analytical scaling relations and high-resolution simulation results on Hall MHD reconnection will be presented, and the efficacy of this mechanism for the galactic dynamo will be evaluated.
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