The statistical characteristics of turbulent particle flux Gamma(turb) due to the correlated fluctuations of density and (E) over right arrowx (B) over right arrow -drift velocity in the simple magnetized torus Thorello [S. Alba, M. Fontanesi, A. Galassi, C. Riccardi, and E. Sindoni, Phys. Essays 6, 225 (1993)] are studied. The focus is on the shape and the low-order moments (absolute width, rms width, skewness, and kurtosis) of the probability distribution functions (PDF), and on how they change as a function of time-resolution tau upon coarse-graining. The way the shape of the PDF and its moments change are closely linked to each other, and they lend support to the view of two distinct regimes, separated by tau(break)approximate to50 mus. In both regimes, however, the statistical evidence for self-similarity, power-law scaling, and non-Gaussianity is rather mixed. The behavior at small tau is interpreted as due to the presence of smooth, positively correlated (and possibly coherent, i.e., long-lived) structures within the data, and the behavior at large tau as due to the standard (i.e., Gaussian, as opposed to the Levy-Gnedenko) Central Limit Theorem. (C) 2002 American Institute of Physics.

Trasarti Battistoni, R., Draghi, D., Riccardi, C., Roman, H. (2002). Self-similarity, power-law scaling, and non-Gaussianity of turbulent fluctuation flux in a nonfusion magnetoplasma. PHYSICS OF PLASMAS, 9(8), 3369-3377.

Self-similarity, power-law scaling, and non-Gaussianity of turbulent fluctuation flux in a nonfusion magnetoplasma

RICCARDI, CLAUDIA;ROMAN, HECTOR EDUARDO
2002

Abstract

The statistical characteristics of turbulent particle flux Gamma(turb) due to the correlated fluctuations of density and (E) over right arrowx (B) over right arrow -drift velocity in the simple magnetized torus Thorello [S. Alba, M. Fontanesi, A. Galassi, C. Riccardi, and E. Sindoni, Phys. Essays 6, 225 (1993)] are studied. The focus is on the shape and the low-order moments (absolute width, rms width, skewness, and kurtosis) of the probability distribution functions (PDF), and on how they change as a function of time-resolution tau upon coarse-graining. The way the shape of the PDF and its moments change are closely linked to each other, and they lend support to the view of two distinct regimes, separated by tau(break)approximate to50 mus. In both regimes, however, the statistical evidence for self-similarity, power-law scaling, and non-Gaussianity is rather mixed. The behavior at small tau is interpreted as due to the presence of smooth, positively correlated (and possibly coherent, i.e., long-lived) structures within the data, and the behavior at large tau as due to the standard (i.e., Gaussian, as opposed to the Levy-Gnedenko) Central Limit Theorem. (C) 2002 American Institute of Physics.
Articolo in rivista - Articolo scientifico
self-similarity, correlated fluctuations, simple magnetized plasma THORELLO
English
2002
9
8
3369
3377
none
Trasarti Battistoni, R., Draghi, D., Riccardi, C., Roman, H. (2002). Self-similarity, power-law scaling, and non-Gaussianity of turbulent fluctuation flux in a nonfusion magnetoplasma. PHYSICS OF PLASMAS, 9(8), 3369-3377.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/2146
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