Feedback of zonal flows on wave turbulence driven by small-scale instability in the Charney-Hasegawa-Mima model
Connaughton, Colm, Nazarenko, Sergei and Quinn, B.. (2011) Feedback of zonal flows on wave turbulence driven by small-scale instability in the Charney-Hasegawa-Mima model. EPL (Europhysics Letters), Vol.96 (No.2). Article No.25001. ISSN 0295-5075Full text not available from this repository.
Official URL: http://dx.doi.org/10.1209/0295-5075/96/25001
We demonstrate theoretically and numerically the zonal-flow/drift-wave feedback mechanism in an idealised 2-dimensional model of plasma turbulence driven by a small-scale instability. Zonal flows are generated by a secondary modulational instability of the modes which are directly driven by the primary instability. The zonal flows then suppress the small scales thereby arresting the energy injection into the system, a process which can be described using nonlocal (in scale) wave turbulence theory. Finally, the arrest of the energy input results in saturation of the zonal flows at a level which can be estimated from the theory and the system reaches stationarity without large-scale dissipation.
|Item Type:||Journal Article|
|Divisions:||Faculty of Science > Mathematics
Faculty of Science > Centre for Scientific Computing
|Journal or Publication Title:||EPL (Europhysics Letters)|
|Publisher:||Institute of Physics Publishing Ltd.|
|Page Range:||Article No.25001|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Engineering and Physical Sciences Research Council (EPSRC)|
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