Abstract
The mechanisms for the generation of mean density and current velocity fields in a medium with a vertical shear, conditioned by the non-linearity of packets of internal waves are analysed. Modulation instability of internal waves is studied allowing for the earth's rotation. A non-linear Schrödinger's equation for the evolution of the envelope has been derived. Also corrections to the mean density and current velocity in the approximation, quadratic by the wave's amplitude, non-oscillating on the wave's time scale have been obtained. The longitudinal modulation conditions have been analysed.
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