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Feedback of zonal flows on wave turbulence driven by small-scale instability in the Charney-Hasegawa-Mima model
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Connaughton, Colm, Nazarenko, Sergey 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. doi:10.1209/0295-5075/96/25001 ISSN 0295-5075.
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Official URL: http://dx.doi.org/10.1209/0295-5075/96/25001
Abstract
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 | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing |
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Journal or Publication Title: | EPL (Europhysics Letters) | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0295-5075 | ||||
Official Date: | 2011 | ||||
Dates: |
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Volume: | Vol.96 | ||||
Number: | No.2 | ||||
Page Range: | Article No.25001 | ||||
DOI: | 10.1209/0295-5075/96/25001 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||
Grant number: | EP/H051295/1 |
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