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The Magnetic Field Structures of a Class of Fast Dynamos

Published online by Cambridge University Press:  19 July 2016

Y.-T. Lau  and
J.M. Finn
Y.-T. Lau
Affiliation:
National Research Council NASA-Goddard Space Flight Center, Code 930.1 Greenbelt, MD 20771, USA
J.M. Finn
Affiliation:
Laboratory for Plasma Research University of Maryland College Park, MD 20742, USA

Abstract

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We study the magnetic field structures of fast kinematic dynamos for a class of steady chaotic flows with stagnation points. We find that the dynamos are generated by a stretch-fold-shear mechanism, which is effective only when the chaotic flow region is large enough and overlaps significantly with the rotating flux tubes.

Keywords

Fast DynamoKinematic DynamoChaotic flow
Type
6. General Aspects of Dynamo Theory
Information
Symposium - International Astronomical Union , Volume 157: The Cosmic Dynamo , 1993 , pp. 231 - 235
Copyright
Copyright © Kluwer 1993 

References

Vainshtein, S.I. and Zel'dovich, Ya.B.: 1972, “Origin of magnetic fields in astrophysics,” Soviet Phys. Uspekhi 15, 159.CrossRefGoogle Scholar
Finn, J.M., Hanson, J.D., Kan, I., and Ott, E.: 1991, “Steady fast dynamo flows,” Phys. Fluids B 3, 1250 and references therein.Google Scholar
Lau, Y.-T. and Finn, J.M.: 1992, “Dynamics of a three-dimensional incompressible flows with stagnation points,” Physica D57, 283.Google Scholar
Lau, Y.-T. and Finn, J.M.: 1993, “Fast dynamos with finite resistivity in steady flows with stagnation points,” to be published in Phys. Fluids B. Google Scholar