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| Titel |
Nonlinear electrostatic ion-acoustic "oscilliton" waves driven by charge non-neutrality effects |
| VerfasserIn |
J. Z. G. Ma, A. Hirose, J.-P. St.-Maurice, W. Liu |
| 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 ; 29, no. 1 ; Nr. 29, no. 1 (2011-01-11), S.123-145 |
| Datensatznummer |
250016953
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| Publikation (Nr.) |
 copernicus.org/angeo-29-123-2011.pdf |
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| Zusammenfassung |
| Nonlinear "oscilliton" structures features a low-frequency
(LF) solitary envelope, the amplitude of which is modulated
violently by superimposed high-frequency (HF) oscillations. We have studied
the charge non-neutrality effects on the excitation of electrostatic
ion-acoustic (IA) oscillitons. A two-fluid, warm plasma model is
employed, and a set of nonlinear self-similar equations is solved in
a cylindrical geometry. Under charge-neutrality conditions, three
conventional IA structures (namely, sinusoidal, sawtooth, and
spicky/bipolar) are obtained. By contrast, under charge
non-neutrality conditions, oscilliton structures are excited, where
the LF envelope is in the sound-wave (SW) mode, while the HF
ingredients include the IA mode and the ion-Langmiur (IL) mode. The
amplitudes of the SW wave are violently modulated by the IA
oscillations, whereas the upward sides of the IA amplitudes are
modulated by the IL oscillations of smaller amplitudes, and the
downward sides are modulated by hybrid IA/IL oscillations. The
nonlinear oscillitons are found to be dependent not only upon the input
parameters (e.g., the Mach number, the Debye length, and the initial
temperature of particles), but on initial conditions as well. |
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