HR: 1340h
AN: SH23A-1146    [Abstracts]
TI: Stochastic features of small scale magnetic field fluctuations in solar wind turbulence
AU: * Consolini, G
EM: giuseppe.consolini@ifsi-roma.inaf.it
AF: Ist. Fisica Spazio Interplanetario, INAF, Via del Fosso del Cavaliere, 100, Roma, 00133, Italy
AU: Bavassano, B
EM: bruno.bavassano@ifsi-roma.inaf.it
AF: Ist. Fisica Spazio Interplanetario, INAF, Via del Fosso del Cavaliere, 100, Roma, 00133, Italy
AB: Since early 90's it was shown that Probability Distribution Functions (PDFs) of small scale fluctuations of solar wind parameters (magnetic field, plasma velocity, etc.) display significant departures from Gaussianity. The non- Gaussian shape of PDFs was ascribed to intermittency and discussed in the framework of intermittent MHD turbulence. Here, we investigate the stochastic nature of the small scale fluctuations of magnetic field, as observed by Ulysses, by comparing the shape of PDFs (and cumulative distribution) to the prediction of a simple theoretical probabilistic model based on the subordination principle. The results suggest that small scale magnetic field fluctuations results from the superposition of a comprise of multiscale coherent magnetic structures.
DE: 2134 Interplanetary magnetic fields
DE: 4468 Probability distributions, heavy and fat-tailed (3265)
DE: 4490 Turbulence (3379, 4568, 7863)
DE: 7857 Stochastic phenomena (3235, 3265, 4475)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting