Statistical theory of subcritically-excited strong turbulence in inhomogeneous plasmas. V

A statistical theory of strong plasma turbulence in nonlinear-nonequilibriu m state is extended. By use of the spectral decomposition method, the renor malized propagator is decomposed into the projection operators. The decompo sition of fluctuation fields into the least stable branch and other branche s is explicitly made. The extended fluctuation dissipation theorem is deriv ed for each decomposed renormalized mode. The decorrelation rate, eddy damp ing rate, fluctuation level and correlation functions are obtained even in the case that the cross-correlation functions and auto-correlation function s are of the same order of magnitude. The Fokker-Planck equation is reformu lated for fluctuation components of each branch. These results are generali zation of the previous result. It is confirmed that the solutions: probabil ity distribution function and related transition probability which have bee n obtained in previous analyses are found valid apart from a numerical coef ficient of the order of unity. In order to show the wider applicability, a case of plasma turbulence which is described by the four-field reduced set of equations is also discussed.