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

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 increa...

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Bibliographic Details
Main Authors: A. S. Leonovich, V. A. Mazur
Format: Article
Language:English
Published: Copernicus Publications 1998-08-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/16/914/1998/angeo-16-914-1998.pdf
Description
Summary: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.<br><br><b>Key words.</b> Ionosphere-magnetosphere interactions · Wave propagation · MHD waves and instabilities</p>
ISSN:0992-7689
1432-0576