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| Titel |
Nonlinear saturation of Rayleigh-Taylor instability and generation of shear flow in equatorial spread-F plasma |
| VerfasserIn |
N. Chakrabarti, G. S. Lakhina |
| 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 ; 8, no. 3 ; Nr. 8, no. 3, S.181-190 |
| Datensatznummer |
250005520
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| Publikation (Nr.) |
 copernicus.org/npg-8-181-2001.pdf |
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| Zusammenfassung |
| An analysis of low
order mode coupling equations is used to describe the nonlinear behaviour
of the Rayleigh-Taylor (RT) instability in the equatorial ionosphere. The
nonlinear evolution of RT instability leads to the development of shear
flow. It is found that there is an interplay between the nonlinearity and
the shear flow which compete with each other and saturate the RT mode,
both in the collisionless and collisional regime. However, the nonlinearly
saturated state, normally known as vortices or bubbles, may not be stable.
Under certain condition these bubbles are shown to be unstable to short
scale secondary instabilities that are driven by the large gradients which
develop within these structures. Some understanding of the role of
collisional nonlinearity in the shear flow generations is also
discussed. |
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