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| Titel |
On a nonlinear state of the electromagnetic ion/ion cyclotron instability |
| VerfasserIn |
M. Cremer, M. Scholer |
| 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 ; 7, no. 3/4 ; Nr. 7, no. 3/4, S.173-177 |
| Datensatznummer |
250004254
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| Publikation (Nr.) |
 copernicus.org/npg-7-173-2000.pdf |
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| Zusammenfassung |
| We have investigated the nonlinear properties
of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid
simulations (macroparticle ions, massless electron fluid). The instability is
driven by the relative (super-Alfvénic) streaming of two field-aligned ion beams
in a low beta plasma (ion thermal pressure to magnetic field pressure) and may
be of importance in the plasma sheet boundary layer. As shown in previously
reported simulations the waves propagate obliquely to the magnetic field and
heat the ions in the perpendicular direction as the relative beam velocity
decreases. By running the simulation to large times it can be shown that the
large temperature anisotropy leads to the ion cyclotron instability (IC) with
parallel propagating Alfvén ion cyclotron waves. This is confirmed by numerically
solving the electromagnetic dispersion relation. An application of this property
to the plasma sheet boundary layer is discussed. |
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