Generation of zonal flow and magnetic field by coupled internal-gravity and alfvén waves in the ionospheric E-layer

Kaladze, T. D.; Kahlon, L. Z.; Tsamalashvili, L. V.; Kaladze, D.T.

doi:10.1016/j.jastp.2012.08.012

Cited by 6 publications

(21 citation statements)

References 32 publications

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“…[9] Investigation of the mean zonal-flow generation problem in the electrically conducting ionosphere was undertaken in Kaladze et al [2005Kaladze et al [ , 2007aKaladze et al [ , 2007bKaladze et al [ , 2009Kaladze et al [ , 2012aKaladze et al [ , 2012b, where the slow waves of the magnetized Rossby branch drive the Reynolds stresses in the E layer. The earlier results found as special limits of the more general nonlinear wave equations developed here.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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[1] Planetary-scale waves and vortices in the weakly ionized ionospheric E layer are dominated by the Hall conductivity that couples the Rossby and Alfvén dynamics giving rise to what are called Rossby-Alfvén-Khantadze electromagnetic structures. At finite amplitudes we show that the nonlinearities in the dynamics generate sheared zonal-flow velocities and zonal magnetic field fluctuations. The zonal-flow mechanism is based on the parametric excitation of the zonal variations through three-wave mode coupling in the planetary-scale waves. The coupled dynamics of the nonlinear 3-D incompressible flows and the magnetic field fluctuations are derived and used to derive the structure and growth rates for the zonal flows and zonal magnetic fields. Large-amplitude planetary waves are shown to drive up magnetic fluctuations up to 100 nT.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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“…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%

“…But during the last decade a great amount of publications revealed different nonlinear mechanisms leading to the generation of sheared zonal flow. Namely the excitation of zonal flow based on the triple planetary waves nonlinear parametric instability in the Earth's ionospheric medium was widely investigated (see [14] [16]- [30] and references cited in).…”

Section: Introductionmentioning

confidence: 99%

“…basic 2D nonlinear equations describing the dynamics of zonal flow generation and coupled internal-gravity and Alfven wave propagation under the Boussinesq approximation are constructed (see details in[14] [22] [28][30]). Caused by the gravity force action altitude distribution of the equilibrium density and pressure of the medium (so called stratification) is taken into account.…”

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confidence: 99%

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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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“…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%

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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Generation of zonal flow and magnetic field by coupled internal-gravity and alfvén waves in the ionospheric E-layer

Cited by 6 publications

References 32 publications

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

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

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

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

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