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| Titel |
Generation of kinetic Alfvén waves by beam-plasma interaction in non-uniform plasma |
| VerfasserIn |
M. H. Hong, Y. Lin, X. Y. Wang |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065058
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| Zusammenfassung |
| This work reports a novel mechanism of the generation of kinetic Alfvén waves (KAWs) using a two-dimensional hybrid simulation: the KAWs are generated by ion beam-plasma interaction in a nonuniform plasma boundary layer, in which the bulk velocity of the ion beam is assumed to be parallel to the ambient magnetic field. As a result of the beam-plasma interaction, strong shear Alfvén waves as well as fast mode compressional waves are first generated on the side of the boundary layer with a high density and thus a low Alfvén speed, propagating along the background magnetic field. Later, Alfvén waves also form inside the boundary layer with a continuous spectrum. As the perpendicular wave number k⊥ of these unstably excited waves increases with time, large-amplitude, short wavelength KAWs with k⊥>> parallel wave number k∥ clearly form in the boundary layer. The physics for the generation of KAWs is discussed. |
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