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Guided propagation of Alfvén waves in the magnetosphere

Published online by Cambridge University Press:  13 March 2009

J. A. Fejer  and
Kaifong Lee
J. A. Fejer
Affiliation:
Department of Applied Electrophysics, University of California, San Diego and Institute for Radiation Physics and Aerodynamics
Kaifong Lee
Affiliation:
Department of Applied Electrophysics, University of California, San Diego and Institute for Radiation Physics and Aerodynamics
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Abstract

The guided propagation of Alfvén waves in a cold plasma is discussed from several points of view. First the field of a line source is calculated at infinity. This calculation leads to a divergence in the radiated power in two directions forming very small angles with the magnetic field.

The divergence is removed if the line source is replaced by a strip source of finite width. It is shown that propagation from a strip source only a few kilo-metres wide is strongly guided by the magnetic field, with almost no spreading, along a field line extending up to, say, 4 earth radii for wave periods of about 100 sec.

Type
Research Article
Information
Journal of Plasma Physics , Volume 1 , Issue 4 , November 1967 , pp. 387 - 406
Copyright
Copyright © Cambridge University Press 1967

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References

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