Excitation of zonal flow and magnetic field by Rossby–Khantadze electromagnetic planetary waves in the ionospheric E-layer

Abstract

Nonlinear dynamics of Rossby-Khantadze electromagnetic planetary waves in the weakly ionized ionospheric E-layer is investigated. Along with the prevalent effect of Hall conductivity for these waves, the latitudinal inhomogeneity of both the Earth's angular velocity and the geomagnetic field becomes essential. It is shown that such short wavelength turbulence of Rossby-Khantadze waves is unstable with respect to the excitation of low-frequency and large-scale perturbations of the zonal flow and magnetic field. The nonlinear mechanism of the instability is driven by the advection of vorticity, leading to the inverse energy cascade toward the longer wavelength. The growth rate of the corresponding instability is found. It is shown that the generation of the intense mean magnetic field is caused by the latitudinal gradient of the geomagnetic field.

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

“…[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.…”

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

“…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.…”

“…The maximum numerical value for generated mean magnetic field is (see Kaladze et al. 2012 a for details).…”

“…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 ).…”

“…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 2012a;Kaladze et al 2012bKaladze et al , 2013a. 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.…”