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The mean electromotive force generated by random Alfvén waves in a collisionless plasma under a non-uniform mean magnetic field

Published online by Cambridge University Press:  13 March 2009

Tomikazu Namikawa  and
Hiromitsu Hamabata
Tomikazu Namikawa
Affiliation:
Department of Physics, Faculty of Science, Osaka City University, Osaka, Japan
Hiromitsu Hamabata
Affiliation:
Department of Physics, Faculty of Science, Osaka City University, Osaka, Japan
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Abstract

The mean electromotive force generated by random Alfvén waves in a collision-less plasma is evaluated taking into account mean magnetic field gradients. It is shown that the mean electromotive force associated with a magnetic shear of the mean field and the helicity spectrum function of the random velocity field exists and has a component parallel to the mean magnetic field when it is generated by random waves propagating along the mean magnetic field and by statistically anisotropic random waves propagating in arbitrary directions. The results are applied to the magnetospheric substorms.

Type
Research Article
Information
Journal of Plasma Physics , Volume 28 , Issue 2 , October 1982 , pp. 293 - 298
Copyright
Copyright © Cambridge University Press 1982

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References

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