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| Titel |
Theory of azimuthally small-scale hydromagnetic waves in the axisymmetric magnetosphere with finite plasma pressure |
| VerfasserIn |
D. Y. Klimushkin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 16, no. 3 ; Nr. 16, no. 3, S.303-321 |
| Datensatznummer |
250013198
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| Publikation (Nr.) |
 copernicus.org/angeo-16-303-1998.pdf |
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| Zusammenfassung |
The structure of monochromatic MHD-waves with
large azimuthal wave number m≫1 in a two-dimensional model of the
magnetosphere has been investigated. A joint action of the field line curvature,
finite plasma pressure, and transversal equilibrium current leads to the
phenomenon that waves, standing along the field lines, are travelling across the
magnetic shells. The wave propagation region, the transparency region, is
bounded by the poloidal magnetic surface on one side and by the resonance
surface on the other. In their meaning these surfaces correspond to the usual
and singular turning points in the WKB-approximation, respectively. The wave is
excited near the poloidal surface and propagates toward the resonance surface
where it is totally absorbed due to the ionospheric dissipation. There are two
transparency regions in a finite-beta magnetosphere, one of them corresponds to
the Alfvén mode and the other to the slow magnetosound mode.
Key words. Magnetosphere · Azimuthally small-scale
waves · MHD waves |
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