Zonal flows and magnetic fields driven by large‐amplitude Rossby‐Alfvén‐Khantadze waves in the <i>E</i>‐layer ionosphere

Kaladze, T. D.; Horton, W.; Kahlon, L. Z.; Pokhotelov, O. A.; Onishchenko, O. G.

doi:10.1002/2013ja019415

Cited by 10 publications

(9 citation statements)

References 45 publications

(55 reference statements)

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“…The basic assumptions, conditions, initial nonlinear system of equations, linear dispersion relation, zonal dispersion, zonal growth rate and excited magnetic field results for CIGA, CRK and CRAK are shown in table 1 and discussed in detail in Kaladze et al. (2012 a , b , 2013 a , b ) of our investigation.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the values for the excited mean magnetic field become (see Kaladze et al. 2013 a , b for details).…”

Section: Discussionmentioning

confidence: 99%

“…The goal of this paper is to review the possibility of generation of zonal flow and magnetic field by different coupled EM ULF waves in the Earth’s ionospheric E-layer on the basis of our investigations (see Kaladze, Kahlon & Tsamalashvili 2012 a ; Kaladze et al. 2012 b , 2013 a , b ). Taking into account a latitudinal inhomogeneity of Coriolis parameter and geomagnetic field, the propagation of coupled internal-gravity–Alfvén (CIGA), coupled Rossby–Khantadze (CRK) and coupled Rossby–Alfvén–Khantadze (CRAK) waves is revealed and studied.…”

Section: Introductionmentioning

confidence: 99%

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Generation of zonal flow and magnetic field in the ionospheric E-layer

Kahlon

Kaladze

2015

J. Plasma Phys.

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We review the generation of zonal flow and magnetic field by coupled electromagnetic ultra-low-frequency waves in the Earth’s ionospheric E-layer. It is shown that, under typical ionospheric E-layer conditions, different planetary low-frequency waves can couple with each other. Propagation of coupled internal-gravity–Alfvén, coupled Rossby–Khantadze and coupled Rossby–Alfvén–Khantadze waves is revealed and studied. A set of appropriate equations describing the nonlinear interaction of such waves with sheared zonal flow is derived. The conclusion on the instability of short-wavelength turbulence of such coupled waves with respect to the excitation of low-frequency and large-scale perturbation of the sheared zonal flow and sheared magnetic field is deduced. The nonlinear mechanism of the instability is based on the parametric triple interaction of finite-amplitude coupled waves leading to the inverse energy cascade towards longer wavelength. The possibility of generation of an intense mean magnetic field is shown. Obtained growth rates are discussed for each case of the considered coupled waves.

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Section: Resultsmentioning

confidence: 99%

“…Then, the values for the excited mean magnetic field become (see Kaladze et al. 2013 a , b for details).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generation of zonal flow and magnetic field in the ionospheric E-layer

Kahlon

Kaladze

2015

J. Plasma Phys.

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“…Nonlinear dynamics of CRAK EM planetary modes in the ionospheric E-layer is investigated (see details in [16] [30]). It is shown that under the prevalent action of Hall conductivity, owing to the latitudinal non-homogeneity of both the Coriolis parameter and stationary geomagnetic field, a new type of CRAK wave can propagate.…”

Section: Generation By Crak Wavesmentioning

confidence: 99%

“…Latitudinal inhomogeneity of both the Coriolis parameter and the geomagnetic field, and also caused by the gravitation so called stratification under the ionospheric conditions lead to the coupling of different electromagnetic (EM) planetary waves such as coupled Rosssby-Khantadze (CRK) [12] [13], Internal-Gravity-Alfven (CIGA) [14], Rossby-Alfven-Khantadze modes (CRAK) [15] [16] and drift-Alfven modes (CDA) [17] [18]. According to the nowadays presentations sheared zonal flows are created by the nonhomogeneous heating of the atmospheric layers by solar radiation.…”

Section: Introductionmentioning

confidence: 99%

Generation of Zonal Flow and Magnetic Field by Planetary Waves in the Earth’s Ionosphere

Kaladze¹,

Chargazia²,

Kharshiladze³

et al. 2016

JAMP

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Possibility of generation of large-scale sheared zonal flow and magnetic field by coupled under the typical ionospheric conditions short-scale planetary low-frequency waves is shown. Propagation of coupled internal-gravity-Alfven, Rossby-Khantadze, Rossby-Alfven-Khantadze and collision-less electron skin depth order drift-Alfven waves is revealed and investigated in detail. To describe the nonlinear interaction of such coupled waves with sheared zonal flow the corresponding nonlinear equations are deduced. The instability mechanism is based on the nonlinear parametric triple interaction of the finite amplitude short-scale planetary waves leading to the inverse energy cascade toward the longer wavelengths. It is shown that under such interaction intense sheared magnetic fields can be generated. Appropriate growth rates are discussed in detail.

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Linear coupling of planetary scale waves in ionospheric zonal shear winds: Generation of fast magnetic waves

et al. 2016

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Our goal is to gain new insight into the physics of wave dynamics in ionospheric zonal shear flows. We study the shear flow non-normality induced linear coupling of planetary scale (slow) modified Rossby waves and westward propagating fast magnetized (Khantadze) waves using an approach different from the existing one to the linear wave dynamics. The performed analysis allows us to separate from each other different physical processes, grasp their interplay, and, by this way, construct the basic physics of the linear coupling of the slow and fast waves in an ionospheric zonal flow with linear shear of mean velocity, U0=(Sy,0). It should be noted from the beginning that we consider incompressible flow and the classified “slow” and “fast” waves are not connected with the similarly labeled magnetosonic waves in compressible heliosphere. We show that: the modified Rossby waves generate fast magnetized waves due to the coupling for a quite wide range of ionospheric and shear flow parameters; the linear transient processes are highly anisotropic in wavenumber plane; the generation of the magnetized waves/oscillations is most efficient/optimal for S≃0.1 (S is the shear rate normalized to the combination of the angular velocity and latitude, Ω0 cos θ0); the streamwise wave number of the optimally generated magnetized wave harmonics decreases (the length scale increases) with increasing the Hall parameter, α. At the end, we discuss nonlinear consequences of the described anisotropic linear dynamics—they should lead to an anisotropy of nonlinear cascade processes (in wavenumber plane). In turn, an interplay of the analyzed quite strong transient growth of the fast magnetic waves with anisotropic nonlinear processes should ensure self-sustenance of (stochastic or regular) magnetic perturbations.

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Zonal flows and magnetic fields driven by large‐amplitude Rossby‐Alfvén‐Khantadze waves in the E‐layer ionosphere

Cited by 10 publications

References 45 publications

Generation of zonal flow and magnetic field in the ionospheric E-layer

Generation of zonal flow and magnetic field in the ionospheric E-layer

Generation of Zonal Flow and Magnetic Field by Planetary Waves in the Earth’s Ionosphere

Linear coupling of planetary scale waves in ionospheric zonal shear winds: Generation of fast magnetic waves

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