Alfvén wave resonances and flow induced by nonlinear Alfvén waves in a stratified atmosphere

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Magnetohydrodynamics And Plasmas, Magnetohydrodynamic Waves

Scientific paper

A nonlinear, time-dependent, ideal MHD code has been developed and used to compute the flow induced by nonlinear Alfvén waves propagating in an isothermal, stratified, plane-parallel atmosphere. The code is based on characteristic equations solved in a Lagrangian frame. Results show that resonance behavior of Alfvén waves exists in the presence of a continuous density gradient and that the waves with periods corresponding to resonant peaks exert considerably more force on the medium than off-resonance periods. If only off-peak periods are considered, the relationship between the wave period and induced longitudinal velocity shows that short period WKB waves push more on the background medium than longer period, non-WKB, waves. The results also show the development of the longitudinal waves induced by finite amplitude Alfvén waves. Wave energy transferred to the longitudinal mode may provide a source of localized heating.

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