### Once again about the parallel between stratification and rotation in hydrodynamics and between both and external magnetic field in MHD

Zeitlin, V *(LMD-ENS)*

Thursday 11 December 2008, 16:00-16:30

Seminar Room 1, Newton Institute

#### Abstract

On the example of simplified 2D models I will discuss the mathematical background of the well-known parallel between the effects of stratification, rotation and external magnetic field. Special emphasis will be made on the fact that Hamiltonian structure of the corresponding hydrodynamical systems is the same, and the consequences of this fact in what concerns both the coherent structures (stationary nonlinear waves/vortices) and the equilibrium spectra of wave turbulence of anisotropic waves proper to each effect (internal gravity waves, gyroscopic waves, and Alfven waves, respectively)

#### Presentation

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