Fast dynamo action in a steady chaotic flow

Details Fast dynamo action in a steady chaotic flow Fast dynamo action in a steady chaotic flow

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350..483g&link_type=abstract

Nature (ISSN 0028-0836), vol. 350, April 11, 1991, p. 483-485. Gonville and Caius College-supported research.

Physics

21

Chaos, Dynamo Theory, Helical Flow, Solar Magnetic Field, Steady Flow, Conducting Fluids, Magnetic Diffusion, Magnetic Field Configurations

Scientific paper

The evolution of a magnetic field in a solar fast dynamo consisting of a helical flow is examined. The flow possesses a web of chaotic streamlines mingled with tubes of regular streamlines. In the case of no magnetic diffusion, intense stretching and folding of the magnetic field in the chaotic regions of the flow is observed. The folding brings together field that is largely aligned in the same direction, and the average field in a chaotic region therefore grows exponentially with time. This provides evidence for fast dynamo action, the main effect of weak diffusion being to average the field locally, and indicates that smooth, steady chaotic flows can be fast dynamos.

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