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Alfvén simple waves

Published online by Cambridge University Press:  04 February 2010

G. M. WEBB ,
G. P. ZANK ,
R. H. BURROWS  and
R. E. RATKIEWICZ
G. M. WEBB
Affiliation:
CSPAR, The University of Alabama in Huntsville, Huntsville, AL 35805, USA (gary.webb@uah.edu)
G. P. ZANK
Affiliation:
CSPAR, The University of Alabama in Huntsville, Huntsville, AL 35805, USA (gary.webb@uah.edu) Department of Physics, The University of Alabama in Huntsville, Huntsville, AL 35899, USA
R. H. BURROWS
Affiliation:
CSPAR, The University of Alabama in Huntsville, Huntsville, AL 35805, USA (gary.webb@uah.edu)
R. E. RATKIEWICZ
Affiliation:
Space Research Center, Bartycka 18A, 00-716 Warsaw, Poland
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Abstract

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Multi-dimensional Alfvén simple waves in magnetohydrodynamics (MHD) are investigated using Boillat's formalism. For simple wave solutions, all physical variables (the gas density, pressure, fluid velocity, entropy, and magnetic field induction in the MHD case) depend on a single phase function ϕ, which is a function of the space and time variables. The simple wave ansatz requires that the wave normal and the normal speed of the wave front depend only on the phase function ϕ. This leads to an implicit equation for the phase function and a generalization of the concept of a plane wave. We obtain examples of Alfvén simple waves, based on the right eigenvector solutions for the Alfvén mode. The Alfvén mode solutions have six integrals, namely that the entropy, density, magnetic pressure, and the group velocity (the sum of the Alfvén and fluid velocity) are constant throughout the wave. The eigenequations require that the rate of change of the magnetic induction B with ϕ throughout the wave is perpendicular to both the wave normal n and B. Methods to construct simple wave solutions based on specifying either a solution ansatz for n(ϕ) or B(ϕ) are developed.

Information

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 1 , February 2011 , pp. 51 - 93
Copyright
Copyright © Cambridge University Press 2010

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