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Role of the interchange mode in plasma diffusion

We have investigated the effect of a nonlinear localized structure obtained through the self-interaction of the interchange mode, on the diffusion in a plasma. The nonlinear localized structure is obtained with periodic boundary conditions in the density gradient direction and a modulation perturbation in the drift direction. We have obtained the expressions of the diffusion tensor in the plane perpendicular to the magnetic field using Fick's law. We have also discussed the nature of the diffusion coefficient's in two limits (i) far from and (ii) close to the linear instability region. It is found that the diffusion due to interchange mode both in the far from and close to linear instability regions far exceeds the diffusion generated by the drift mode.