Acoustic-gravity nonlinear structures
نویسندگان
چکیده
A catalogue of nonlinear vortex structures associated with acoustic-gravity perturbations in the Earth’s atmosphere is presented. Besides the previously known KelvinStewart cat’s eyes, dipolar and tripolar structures, new solutions having the form of a row of counter-rotating vortices, and several weakly two-dimensional vortex chains are given. The existence conditions for these nonlinear structures are discussed with respect to the presence of inhomogeneities of the shear flows. The mode-coupling mechanism for the nonlinear generation of shear flows in the presence of linearly unstable acoustic-gravity waves, possibly also leading to intermittency and chaos, is presented.
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