2009/03/12 by F. Sattin, Sattin, F.
Decision Sciences · Economics, Econometrics and Finance · Physics and Astronomy · #Complex Systems and Time Series Analysis #Statistical Mechanics and Entropy #Stock Market Forecasting Methods #physics.plasm-ph
paper · pdf · doi:10.48550/arxiv.0903.2189
10 pages. To be submitted. V2: conclusions unaltered, text and contents improved
arxiv created 2009/04/23 · arxiv updated 2009/12/01
Probability Distributions Functions (PDFs) of fluctuations of plasma edge parameters are skewed curves fairly different from normal distributions, whose shape appears almost independent of the plasma conditions and devices. We start from a minimal fluid model of edge turbulence and reformulate it in terms of uncoupled Langevin equations, admiting analytical solution for the PDFs of all the fields involved. We show that the supposed peculiarities of PDFs, and their universal character, are related to the generic properties of Langevin equations involving quadratic nonlinearities.