Statistical Aspects of Diffusion in Turbulent Plasmas

Doctoral thesis, 2004

In this work we address the closure issue in kinetic and fluid descriptions of turbulent plasmas. In fluid description contribution has been made to the nonlinear closure by Mattor and Parker [Phys. Rev. Lett. 79, 3419 (1997)]. It was generalized by taking into account effects of diffusion due to the background turbulence. In kinetic description we have focused on the Fokker-Planck approach. Within this approach we developed non-Markovian quasilinear theory of particle diffusion in random fields. We have also made a contribution to the theory of Brownian motion of charged particle in constant external electric and magnetic fields. In connection with that, the theory of large-scale fluctuations in plasmas has been developed.