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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, C., 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 0295-5075
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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 |
|---|---|
| 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. |
| ISSN: | 0295-5075 |
| Date: | 2011 |
| Volume: | Vol.96 |
| Number: | No.2 |
| Page Range: | Article No.25001 |
| Identification Number: | 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 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/39669 |
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