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| Titel |
Field-aligned structure of poloidal Alfvén waves in a finite pressure plasma |
| VerfasserIn |
P. N. Mager, D. Yu. Klimushkin, V. A. Pilipenko, S. Schäfer |
| 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 ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-12), S.3875-3882 |
| Datensatznummer |
250016676
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3875-2009.pdf |
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| Zusammenfassung |
| This paper is devoted to analytical and numerical studies of the parallel
structure of poloidal Alfvén waves in a finite pressure plasma. The effects
of finite-beta plasma are especially essential near the magnetospheric
equator, where an opaque (non-transparent) region for Alfvén waves can be
formed. This region is bounded by two turning points which restrain
penetration of the wave energy far from the ionosphere, and an Alfvén
resonator appears on a part of the field line adjacent to the ionosphere. Due
to this effect the ULF pulsations in the Northern and Southern Hemispheres
can be non-conjugated. Another result is a peculiar field-aligned structure
of the wave magnetic field: its fundamental harmonic must have three nodes,
rather than one node as is the case in cold plasma. |
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