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Effect of the shear flow in the generation and self-organization of internal gravity wave structures in the dissipative ionosphere

  • Ionospheric Plasma
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Abstract

A linear mechanism for the generation and amplification of internal gravity waves and their further nonlinear dynamics in the stably stratified dissipative ionosphere in the presence of an inhomogeneous zonal wind (shear flow) is studied. For shear flows, the operators of linear problems are non-self-conjugate and the corresponding eigenfunctions are nonorthogonal. Therefore, the canonical modal approach is poorly applicable to study such motions. In this case, the so-called nonmodal mathematical analysis is more adequate. Dynamic equations and equations for the energy transport of internal gravity perturbations in the ionosphere with shear flows are derived on the basis of the nonmodal approach. Exact analytic solutions of linear and nonlinear equations are found. The growth rate of the shear instability of internal gravity waves is determined. It is revealed that perturbations grow in time according to a power law, rather than exponentially. The frequency and wavenumber of the generated internal gravity modes depend on time; hence, a wide spectrum of wave perturbations caused by linear effects (rather than nonlinear turbulent ones) forms in the ionosphere with shear flows. The efficiency of the linear mechanism for the amplification of internal gravity waves during their interaction with the inhomogeneous zonal wind is analyzed. A criterion for the development of the shear instability of such waves in the ionospheric plasma is obtained. It is shown that, in the presence of shear instability, internal gravity waves extract the shear flow energy in the initial (linear) stage of their evolution, due to which their amplitude and, accordingly, energy increase substantially (by an order of magnitude). As the amplitude increases, the mechanism of nonlinear self-localization comes into play and the process terminates with the self-organization of strongly localized solitary nonlinear internal gravity vortex structures. As a result, a new degree of freedom of the system and a new way of the evolution of perturbations in a medium with a shear flow appear. Inductive and viscous dampings limit the lifetime of vortex internal gravity structures in the ionosphere; nevertheless, their lifetime is long enough for them to strongly affect the dynamic properties of the medium. It is revealed on the basis of the analytic solution of a set of time-independent nonlinear dynamic equations that, depending on the velocity profile of the shear flow, the nonlinear internal gravity structures can take the form of a purely monopole vortex, a dipole cyclone-anticyclone pair, a transverse vortex chain, or a longitudinal vortex path against the background of the inhomogeneous zonal wind. The accumulation of such vortices in the ionosphere can result in a strongly turbulent state.

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Authors and Affiliations

  1. I. Vekua Institute of Applied Mathematics, Tbilisi State University, University str. 2, Tbilisi, 0143, Georgia

    G. D. Aburjania

  2. M. Nodia Institute of Geophysics, Tbilisi State University, Aleksidze str. 1, Tbilisi, 0193, Georgia

    G. D. Aburjania & O. A. Kharshiladze

  3. Physics Department, Calabria University, Rende, Italy

    G. Zimbardo

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  1. G. D. Aburjania
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  2. G. Zimbardo
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  3. O. A. Kharshiladze
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Correspondence to G. D. Aburjania.

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Original Russian Text © G.D. Aburjania, G. Zimbardo, O.A. Kharshiladze, 2012, published in Fizika Plazmy, 2012, Vol. 38, No. 12, pp. 1055–1075.

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Aburjania, G.D., Zimbardo, G. & Kharshiladze, O.A. Effect of the shear flow in the generation and self-organization of internal gravity wave structures in the dissipative ionosphere. Plasma Phys. Rep. 38, 972–990 (2012). https://doi.org/10.1134/S1063780X1212001X

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