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Slowly decaying drift turbulence with wave effects

Published online by Cambridge University Press:  01 May 1999

GIOVANNI MANFREDI
GIOVANNI MANFREDI
Affiliation:
School of Cosmic Physics, Dublin Institute for Advanced Studies, Dublin 2, Ireland Present address: Laboratoire de Physique des Milieux Ionisés, Université Henri Poincaré, 54506 Vandoeuvre-les-Nancy, France.
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Abstract

The effect of linear waves on the Charney–Hasegawa–Mima model of drift and geostrophic turbulence is studied numerically for a slowly decaying field. It is shown that wave effects can reduce the efficiency of nonlinear mode coupling, effectively ‘freezing’ the spectrum to a narrow band in wavenumber space. Selective nonlinear interactions tend to favour velocities parallel to the direction of propagation of the waves. Accordingly, anisotropic spectra are observed, steeper in the direction of wave propagation, and shallower in the perpendicular direction.

Type
Research Article
Information
Journal of Plasma Physics , Volume 61 , Issue 4 , May 1999 , pp. 601 - 622
Copyright
© 1999 Cambridge University Press

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