Standing Alfvén waves with m ? 1 in an axisymmetric magnetosphere excited by a non-stationary source

A. S. Leonovich (1) , V. A. Mazur (1)

1 ISTP - Institute of Solar-Terrestrial Physics [Irkutsk]

As a continuation of our earlier paper, we consider here the case of the excitation of standing Alfvén waves by a source of the type of sudden impulse. It is shown that, following excitation by such a source, a given magnetic shell will exhibit oscillations with a variable frequency which increases from the shell's poloidal to toroidal frequency. Simultaneously, the oscillations will also switch over from poloidally (radially) to toroidally (azimuthally) polarized. With a reasonably large attenuation, only the start of this process, the stage of poloidal oscillations, will be observed in the ionosphere.

Domaines: Océan, Atmosphère; Sciences de la Terre

A. S. Leonovich, V. A. Mazur. Standing Alfvén waves with m ? 1 in an axisymmetric magnetosphere excited by a non-stationary source. Annales Geophysicae, 1998, 16 (8), pp.914-920. ⟨hal-00316423⟩