dorsal/arxiv
View SchemaIntermittency, scaling and the Fokker-Planck approach to fluctuations of the solar wind bulk plasma parameters as seen by the WIND spacecraft
| Authors | Bogdan Hnat, Sandra C. Chapman, George Rowlands |
|---|---|
| Categories | |
| ArXiv ID | physics/0211080 |
| URL | https://arxiv.org/abs/physics/0211080 |
| DOI | 10.1103/PhysRevE.67.056404 |
Abstract
The solar wind provides a natural laboratory for observations of MHD turbulence over extended temporal scales. Here, we apply a model independent method of differencing and rescaling to identify self-similarity in the Probability Density Functions (PDF) of fluctuations in solar wind bulk plasma parameters as seen by the WIND spacecraft. Whereas the fluctuations of speed v and IMF magnitude B are multi-fractal, we find that the fluctuations in the ion density rho, energy densities B^2 and rho v^2 as well as MHD-approximated Poynting flux vB^2 are mono-scaling on the timescales up to ~26 hours. The single curve, which we find to describe the fluctuations PDF of all these quantities up to this timescale, is non-Gaussian. We model this PDF with two approaches-- Fokker-Planck, for which we derive the transport coefficients and associated Langevin equation, and the Castaing distribution that arises from a model for the intermittent turbulent cascade.
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"abstract": "The solar wind provides a natural laboratory for observations of MHD\nturbulence over extended temporal scales. Here, we apply a model independent\nmethod of differencing and rescaling to identify self-similarity in the\nProbability Density Functions (PDF) of fluctuations in solar wind bulk plasma\nparameters as seen by the WIND spacecraft. Whereas the fluctuations of speed v\nand IMF magnitude B are multi-fractal, we find that the fluctuations in the ion\ndensity rho, energy densities B^2 and rho v^2 as well as MHD-approximated\nPoynting flux vB^2 are mono-scaling on the timescales up to ~26 hours. The\nsingle curve, which we find to describe the fluctuations PDF of all these\nquantities up to this timescale, is non-Gaussian. We model this PDF with two\napproaches-- Fokker-Planck, for which we derive the transport coefficients and\nassociated Langevin equation, and the Castaing distribution that arises from a\nmodel for the intermittent turbulent cascade.",
"arxiv_id": "physics/0211080",
"authors": [
"Bogdan Hnat",
"Sandra C. Chapman",
"George Rowlands"
],
"categories": [
"physics.space-ph",
"physics.data-an",
"physics.plasm-ph"
],
"doi": "10.1103/PhysRevE.67.056404",
"title": "Intermittency, scaling and the Fokker-Planck approach to fluctuations of the solar wind bulk plasma parameters as seen by the WIND spacecraft",
"url": "https://arxiv.org/abs/physics/0211080"
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