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| Titel |
Kelvin-Helmholtz vortices and secondary instabilities in super-magnetosonic regimes |
| VerfasserIn |
F. Palermo, M. Faganello, F. Califano, F. Pegoraro |
| 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. 6 ; Nr. 29, no. 6 (2011-06-29), S.1169-1178 |
| Datensatznummer |
250017051
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1169-2011.pdf |
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| Zusammenfassung |
| The nonlinear behaviour of the Kelvin-Helmholtz instability is investigated
with a two-fluid simulation code in both sub-magnetosonic and
super-magnetosonic regimes in a two-dimensional configuration chosen so as to
represent typical conditions observed at the Earth's magnetopause flanks. It
is shown that in super-magnetosonic regimes the plasma density inside the
vortices produced by the development of the Kelvin-Helmholtz instability is
approximately uniform, making the plasma inside the vortices effectively
stable against the onset of secondary instabilities. However, the relative
motion of the vortices relative to the plasma flow can cause the formation of
shock structures. It is shown that in the region where the shocks are
attached to the vortex boundaries the plasma conditions change rapidly and
develop large gradients that allow for the onset of secondary instabilities
not observed in sub-magnetosonic regimes. |
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