Feedback of zonal flows on wave turbulence driven by small-scale instability in the Charney-Hasegawa-Mima model

被引：20
作者：
Connaughton, C. [1 ,2 ]
Nazarenko, S. [1 ]
Quinn, B. [1 ]
机构：
[1] Univ Warwick, Math Inst, Coventry CV4 7AL, W Midlands, England
[2] Univ Warwick, Ctr Complex Sci, Coventry CV4 7AL, W Midlands, England
来源：
EPL | 2011年 / 96卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
ROSSBY WAVES; DRIFT WAVES; GENERATION; INVARIANT; BETA;
D O I：
10.1209/0295-5075/96/25001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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. Copyright (C) EPLA, 2011
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页数：6
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