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...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
1998-08-01
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Series: | Annales Geophysicae |
Online Access: | https://www.ann-geophys.net/16/914/1998/angeo-16-914-1998.pdf |
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> |
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ISSN: | 0992-7689 1432-0576 |