High Quality Content by WIKIPEDIA articles! An Alfven wave, named after Hannes Alfven, is a type of magnetohydrodynamic wave. An Alfven wave in a plasma is a low-frequency (compared to the ion cyclotron frequency) traveling oscillation of the ions and the magnetic field. The ion mass density provides the inertia and the magnetic field line tension provides the restoring force. The wave propagates in the direction of the magnetic field, although waves exist at oblique incidence and smoothly change into the magnetosonic wave when the propagation is perpendicular to the magnetic field. The motion of the ions and the perturbation of the magnetic field are in the same direction and transverse to the direction of propagation. The wave is dispersionless.

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