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| Titel |
Resonant three-wave interaction in the presence of suprathermal electron fluxes |
| VerfasserIn |
C. Krafft, A. Volokitin |
| 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 ; 22, no. 6 ; Nr. 22, no. 6 (2004-06-14), S.2171-2179 |
| Datensatznummer |
250014908
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2171-2004.pdf |
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| Zusammenfassung |
| A theoretical and numerical model is presented which describes the nonlinear
interaction of lower hybrid waves with a non-equilibrium electron
distribution function in a magnetized plasma. The paper presents some
relevant examples of numerical simulations which show the nonlinear
evolution of a set of three waves interacting at various resonance
velocities with a flux of electrons presenting some anisotropy in the
parallel velocity distribution (suprathermal tail); in particular, the case
when the interactions between the waves are neglected (for sufficiently
small waves' amplitudes) is compared to the case when the three waves follow
a resonant decay process. A competition between excitation (due to the fan
instability with tail electrons or to the bump-in-tail instability at the
Landau resonances) and damping processes (involving bulk electrons at the
Landau resonances) takes place for each wave, depending on the strength of
the wave-wave coupling, on the linear growth rates of the waves and on the
modifications of the particles' distribution resulting from the linear and
nonlinear wave-particle interactions. It is shown that the energy carried by
the suprathermal electron tail is more effectively transfered to lower
energy electrons in the presence of wave-wave interactions. |
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