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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 on theme: "Waves Disturbances which travel through space and matter Carry energy and information Sometimes need medium to propagate in (mechanical waves, sound),"— Presentation transcript:

1 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)

2 MHD waves

3 Adiabatic MHD

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

5 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.

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