Waves Disturbances which travel through space and matter Carry energy and information Sometimes need medium to propagate in (mechanical waves, sound),

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Presentation transcript:

Waves Disturbances which travel through space and matter Carry energy and information Sometimes need medium to propagate in (mechanical waves, sound), sometimes don’t (EM waves)

MHD waves

Adiabatic MHD

Linearized MHD Assume equilibrium and small deviations from it: Then:

Linearized MHD Take time derivative of the momentum equation and substitute all other equations into it. 1 equation, 1 unknown! Linearized equation of motion. All studies of MHD waves and instabilities start from this equation.