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| Titel |
Obliquely propagating large amplitude solitary waves in charge neutral plasmas |
| VerfasserIn |
F. Verheest |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 14, no. 1 ; Nr. 14, no. 1 (2007-01-30), S.49-57 |
| Datensatznummer |
250012126
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| Publikation (Nr.) |
 copernicus.org/npg-14-49-2007.pdf |
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| Zusammenfassung |
| This paper deals in a consistent way with the implications, for the
existence of large amplitude stationary structures in general plasmas, of
assuming strict charge neutrality between electrons and ions.
With the limit of pair plasmas in mind, electron inertia is retained.
Combining in a fluid dynamic treatment the conservation of mass, momentum
and energy with strict charge neutrality has indicated that nonlinear
solitary waves (as e.g. oscillitons) cannot exist in electron-ion
plasmas, at no angle of propagation with respect to the static magnetic
field.
Specifically for oblique propagation, the proof has turned out to be
more involved than for parallel or perpendicular modes.
The only exception is pair plasmas that are able to support large charge
neutral solitons, owing to the high degree of symmetry naturally inherent
in such plasmas.
The nonexistence, in particular, of oscillitons is attributed to the
breakdown of the plasma approximation in dealing with Poisson's law,
rather than to relativistic effects.
It is hoped that future space observations will allow to discriminate
between oscillitons and large wave packets, by focusing on the time
variability (or not) of the phase, since the amplitude or envelope graphs
look very similar. |
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