Self-consistent Castaing distribution of solar wind turbulent fluctuations

Abstract

The intermittent behavior of solar wind turbulent fluctuations has often been investigated through the modeling of their probability distribution functions (PDFs). Among others, the Castaing model (Castaing et al. 1990) has successfully been used in the past. In this paper, the energy dissipation field of solar wind turbulence has been studied for fast, slow and polar wind samples recorded by Helios 2 and Ulysses spacecraft. The statistical description of the dissipation rate has then be used to remove intermittency through conditioning of the PDFs. Based on such observation, a self-consistent, parameter-free Castaing model is presented. The self-consistent model is tested against experimental PDFs, showing good agreement and supporting the picture of a multifractal energy cascade at the origin of solar wind intermittency.

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• Recent progress in astrophysical plasma turbulence from solar wind observations
• Turbulence-driven ion beams in the magnetospheric Kelvin-Helmholtz instability
• On the statistical properties of turbulent energy transfer rate in the inner Heliosphere
• Local energy transfer rate and kinetic processes: the fate of turbulent energy in two-dimensional Hybrid Vlasov-Maxwell numerical simulations
• Helios 2 observations of solar wind turbulence decay in the inner heliosphere
• Emergence of skewed non-Gaussian distributions of velocity increments in isotropic turbulence
• Intermittency of Energy Dissipation in Alfvenic Turbulence