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Author(s):
K. Itoh, Y. Nagashima, S.-I. Itoh, P.H. Diamond, A. Fujisawa, M. Yagi and A. Fukuyama
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Title:
On the Bicoherence Analysis of Plasma Turbulence
Date of publication:
Oct. 2005
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Key words:
bicoherence, biphase, drift wave turbulence, zonal flows, geodesic acoustic modes, data analysis
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Abstract:
The bicoherence of fluctuations in a system of drift waves and zonal flows is discussed. In strong drift-wave turbulence, where broad-band fluctuations are excited, the bicoherence is examined. A Langevin equation formalism of turbulent interactions allows us to relate the bicoherence coefficient to the projection of nonlinear force onto the test mode. The dependence of the summed bicoherence on the amplitude of zonal flows is clarified. The importance of observing biphase is also stressed. The results provide a basis for measurement of nonlinear interaction in a system of drift waves and zonal flow.
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