TITLE:
Generation of Zonal Flow and Magnetic Field by Planetary Waves in the Earth’s Ionosphere
AUTHORS:
T. D. Kaladze, Kh. Chargazia, O. Kharshiladze, L. V. Tsamalashvili
KEYWORDS:
Planetary Waves, Sheared Zonal Flow, Ionosphere, Sheared Magnetic Field
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.4 No.2,
February
29,
2016
ABSTRACT: 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.