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A statistical description is developed for a self-sustained subcritical turbulence in inhomogenous plasmas. Interchangemode in the presence of inhomogenous magnetic field, which reveals a submarginal strong turbulence is considered. Nonlinear dispersion relation is extended to a Langevin equation for a dressed test mode, in which nonlinear interactions are kept as renormalized drag and random self noise. Based upon the assumption that the random noise has a faster time scale, the solutions are obtained for the fluctuation level, decorrelation rate, auto- and cross-correlation functions and spectrum. They are expressed as nonlinear functions and spectrum.

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Authors: SANAE I, Max-Planck-Institut fur Plasma physik, Garching bei Munchen (DE);KIMITAKA I, Max-Planck-Institut fur Plasma physik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Journal of the physical Society of Japan, 68 (1999) 6, 1891-1906
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