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| Titel |
Nonlinear compressional electromagnetic ion-cyclotron wavepackets in space plasmas |
| VerfasserIn |
I. Kourakis, P. K. Shukla |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2005-04-07), S.441-450 |
| Datensatznummer |
250010669
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| Publikation (Nr.) |
 copernicus.org/npg-12-441-2005.pdf |
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| Zusammenfassung |
| The parametric coupling between large amplitude magnetic field-aligned circularly polarized electromagnetic ion-cyclotron (EMIC) waves and ponderomotively driven ion-acoustic perturbations in magnetized space
plasmas is considered. A cubic nonlinear Schrödinger equation
for the modulated EMIC wave envelope is derived, and then solved
analytically. The modulated EMIC waves are found to be stable (unstable) against
ion-acoustic density perturbations, in the subsonic (supersonic, respectively) case, and they may
propagate as "supersonic bright" (`"subsonic dark", i.e. "black" or "grey")type envelope solitons, i.e. electric field pulses (holes, voids),associated with (co-propagating) density humps. Explicit bright and dark (black/grey)
envelope excitation profiles are presented, and the relevance of our investigation to space
plasmas is discussed. |
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