| | ALFVÉN WAVE : Encyclopedia Entry |
 | | An Alfvén wave in a plasma is a traveling oscillation of the ions and the magnetic field. |
 | | 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. |
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