Paper Title
Intensification of the LF IG Wave Structures in the Ionospheric Plasma at Interaction with Nonuniform Winds

Abstract
Theoretical explanation of the generation and intensification of low frequency (LF) internal gravity waves (IGW) is presented. The method used is based on generalizing results on shear flow phenomena from the hydrodynamicscommunity. In the 1990s, it was realized that fluctuation modes of spectrally stable nonuniform shearedflows are non-normal. That is, the linear operators of the flows modal analysis are non-normal and the corresponding eigenmodes are not orthogonal. The non-normality results in linear transient growth with bursts of the perturbations and the mode coupling, which causes the amplification of LF IG waves shear flow driven ionospheric plasma. Transient growth substantially exceeds the growth of the classical dissipative trapped-particle instability of the system. It is shown that at initial linear stage of evolution IGW effectively temporarily draws energy from the shear flow significantly increasing (by order of magnitude) own amplitude and energy. With amplitude growth the nonlinear mechanism turns on and the process ends with self-organization of nonlinear solitary, strongly localized IGW vortex structures. Accumulation of these vortices in the ionosphere medium can create the strongly turbulent state.