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Probability Distributions Functions (PDFs) of fluctuations of plasma edgeparameters are skewed curves fairly different from normal distributions, whoseshape appears almost independent of the plasma conditions and devices. We startfrom a minimal fluid model of edge turbulence and reformulate it in terms ofuncoupled Langevin equations, admiting analytical solution for the PDFs of allthe fields involved. We show that the supposed peculiarities of PDFs, and theiruniversal character, are related to the generic properties of Langevinequations involving quadratic nonlinearities.

An Explanation From First-Principle Equations For The Universality of Non-Gaussian Distributions in Edge Plasma Fluctuations