Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-17
Geophys.Res.Lett. 29 (2001) 10:1029
Astronomy and Astrophysics
Astrophysics
4 pages, 5 figures. In press, Geophysical Research Letters
Scientific paper
Statistical properties of the interplanetary magnetic field fluctuations can provide an important insight into the solar wind turbulent cascade. Recently, analysis of the Probability Density Functions (PDF) of the velocity and magnetic field fluctuations has shown that these exhibit non-Gaussian properties on small time scales while large scale features appear to be uncorrelated. Here we apply the finite size scaling technique to explore the scaling of the magnetic field energy density fluctuations as seen by WIND. We find a single scaling sufficient to collapse the curves over the entire investigated range. The rescaled PDF follow a non Gaussian distribution with asymptotic behavior well described by the Gamma distribution arising from a finite range Levy walk. Such mono scaling suggests that a Fokker-Planck approach can be applied to study the PDF dynamics. These results strongly suggest the existence of a common, nonlinear process onthe time scale up to ~26 hours.
Chapman Sandra
Farrell William
Hnat Bogdan
Rowlands George
Watkins Nicholas
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