Feedback of a small-scale magnetic dynamo

Details Feedback of a small-scale magnetic dynamo Feedback of a small-scale magnetic dynamo

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrve..63a6408n&link_type=abstract

Physical Review E, vol. 63, Issue 1, id. 016408

Physics

2

Magnetohydrodynamics And Plasmas, Isotropic Turbulence, Homogeneous Turbulence, High-Reynolds-Number Turbulence

Scientific paper

We develop a WKB approach to the rapid distortion theory for magnetohydrodynamic turbulence with large magnetic Prandtl number. Within this theory, we study the growth of small-scale magnetic fluctuations in a large-scale velocity field being initially a pure strain. We show that the magnetic Lorentz force excites a secondary flow in the form of counterrotating vortices on the periphery of the magnetic spot. Those vortices slow down stretching of the magnetic spot and thus provide a negative feedback for a small-scale magnetic dynamo.

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