Zonal Flow and Stremaer Generation by Small – Scale Drift-Alfven Waves in Ionosphere Plasma
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Abstract
In the present work, the generation of large-scale zonal flows and streamers by modulationally unstable short-scale drift-Alfven waves in the ionosphere is investigated. Positive feedback in the system is achieved via modulation of the skin size drift-Alfven waves by the large-scale zonal flow. The conditions for the instability development and possibility of the generation of large-scale structures are determined. The instability pumps the energy of primarily small-scale Alfven waves into that of the large-scale zonal structures which is typical for an inverse turbulent cascade. Energy pumping into the large-scale region noticeably depends also on the width of the pumping wave spectrum and with an increase of the width of the initial wave spectrum the instability can be suppressed. It is assumed that the investigated mechanism can refer directly to the generation of mean flow in the atmosphere of the rotating planets and the magnetized plasma.
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