Physics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.106y4502k&link_type=abstract
Physical Review Letters, vol. 106, Issue 25, id. 254502
Physics
1
Magnetohydrodynamics And Electrohydrodynamics, Turbulent Flows, Origins And Models Of The Magnetic Field, Dynamo Theories, Electric And Magnetic Fields, Solar Magnetism
Scientific paper
Three-wave turbulent interactions and the role of eddy size on the turbulent electromotive force are studied in a spherical liquid-sodium dynamo experiment. A symmetric, equatorial baffle reduces the amplitude of the largest-scale turbulent eddies, which is inferred from the magnetic fluctuations spectrum (measured by a 2D array of surface probes). Differential rotation in the mean flow is >2 times more effective in generating mean toroidal magnetic fields from the applied poloidal field (via the Ω effect) when the largest-scale eddies are eliminated, thus demonstrating that the global turbulent resistivity (the β effect from the largest-scale eddies) is reduced by a similar amount.
Clark Michael
Forest Cary B.
Kaplan E. J.
Nornberg Mark D.
Rahbarnia K.
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