Statistical theory of subcritically-excited strong turbulence in inhomogeneous plasmas

A statistical description is developed for self-sustained subcritical turbulence of interchange mode in inhomogeneous plasmas. Langevin equation for a dressed test mode, in which coherent and incoherent nonlinear interactions are kept as renormalized drag and random noise, is solved. Fluctuation level, decorrelation rate, auto and cross-correlation functions are obtained for submarginal strong turbulence, as nonlinear functions of non-equilibrium parameters like gradient. Extended Einstein relation and fluctuation-dissipation theorem are described as statistical relations. (orig.)15 refs.Available from TIB Hannover: RA 71(III/234) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman