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Influence of non-monochromaticity on zonal-flow generation by magnetized Rossby waves in the ionospheric E-layer

Published online by Cambridge University Press:  01 June 2009

T. D. KALADZE ,
H. A. SHAH ,
G. MURTAZA ,
L. V. TSAMALASHVILI ,
M. SHAD  and
G. V. JANDIERI
T. D. KALADZE
Affiliation:
Physics Department, GC University, Lahore 54000, Pakistan I. Vekua Institute of Applied Mathematics of Tbilisi State University, 2 University Str., 0143 Tbilisi, Georgia ([email protected])
H. A. SHAH
Affiliation:
Physics Department, GC University, Lahore 54000, Pakistan
G. MURTAZA
Affiliation:
Salam Chair, GC University, Lahore 54000, Pakistan
L. V. TSAMALASHVILI
Affiliation:
I. Vekua Institute of Applied Mathematics of Tbilisi State University, 2 University Str., 0143 Tbilisi, Georgia ([email protected])
M. SHAD
Affiliation:
Physics Department, GC University, Lahore 54000, Pakistan
G. V. JANDIERI
Affiliation:
Physics Department, Georgian Technical University, 77 Kostava str., 0175, Tbilisi, Georgia
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Abstract

The influence of non-monochromaticity on low-frequency, large-scale zonal-flow nonlinear generation by small-scale magnetized Rossby (MR) waves in the Earth's ionospheric E-layer is considered. The modified parametric approach is used with an arbitrary spectrum of primary modes. It is shown that the broadening of the wave packet spectrum of pump MR waves leads to a resonant interaction with a growth rate of the order of the monochromatic case. In the case when zonal-flow generation by MR modes is prohibited by the Lighthill stability criterion, the so-called two-stream-like mechanism for the generation of sheared zonal flows by finite-amplitude MR waves in the ionospheric E-layer is possible. The growth rates of zonal-flow instabilities and the conditions for driving them are determined. The present theory can be used for the interpretation of the observations of Rossby-type waves in the Earth's ionosphere and in laboratory experiments.

Type
Papers
Information
Journal of Plasma Physics , Volume 75 , Issue 3 , June 2009 , pp. 345 - 357
Copyright
Copyright © Cambridge University Press 2008

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