On the Scaling Properties of Magnetic Field Fluctuations Through the Inner Heliosphere

Abstract

Although the interplanetary magnetic field variability has been extensively investigated in situ by means of data coming from several space missions, the newly launched missions providing high-resolution measures and approaching the Sun, offer the possibility to study the multiscale variability in the innermost solar system. Here by means of the Parker Solar Probe measurements we investigate the scaling properties of solar wind magnetic field fluctuations at different heliocentric distances. The results show a clear transition at distances close to say 0.4 au. Closer to the Sun fluctuations show a f^-3/2 frequency power spectra and regular scaling properties, while for distances larger than 0.4 au fluctuations show a Kolmogorov spectrum f^-5/3 and are characterized by anomalous scalings. The observed statistical properties of turbulence suggests that the solar wind magnetic fluctuations, in the late stage far form the Sun, show a multifractal behaviour typical of turbulence and described through intermittency, while in the early stage, when leaving the solar corona, a breakdown of these properties are observed, thus showing a statistical monofractal global self-similarity. Physically the breakdown observed close to the Sun should be due either to a turbulence with regular statistics or to the presence of intense stochastic fluctuations able to cancel out correlations necessary for the presence of anomalous scaling.

arXiv comment12 pages, 4 figures, submitted to ApJL

References in corpus (15)

• Spectrum of magnetohydrodynamic turbulence
• Solar Orbiter: Exploring the Sun-heliosphere connection
• Anisotropic scaling of magnetohydrodynamic turbulence
• The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere
• Recent progress in astrophysical plasma turbulence from solar wind observations
• The slow-mode nature of compressible wave power in solar wind turbulence
• Imbalanced Strong MHD Turbulence
• An amplitude-frequency study of turbulent scaling intermittency using Empirical Mode Decomposition and Hilbert Spectral Analysis
• Role of cross helicity in magnetohydrodynamic turbulence
• Arbitrary-order Hilbert spectral analysis for time series possessing scaling statistics: a comparison study with detrended fluctuation analysis and wavelet leaders
• Using Synthetic Spacecraft Data to Interpret Compressible Fluctuations in Solar Wind Turbulence
• A statistical model of three-dimensional anisotropy and intermittency in strong Alfvénic turbulence
• On Kinetic Slow Modes, Fluid Slow Modes, and Pressure-balanced Structures in the Solar Wind
• Arbitrary-order Hilbert spectral analysis and intermittency in solar wind density fluctuations
• The Impact of Turbulent Solar Wind Fluctuations on Solar Orbiter Plasma Proton Measurements

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• Intermittency in the Expanding Solar Wind: Observations from Parker Solar Probe (0.16au), Helios 1 (0.3-1au), and Voyager 1 (1-10au)
• Magnetic field intermittency in the solar wind: PSP and SolO observations ranging from the Alfven region out to 1 AU
• On the evolution of the Anisotropic Scaling of Magnetohydrodynamic Turbulence in the Inner Heliosphere
• Markovian Features of the Solar Wind at Sub-Proton Scales
• Reconciling Parker Solar Probe observations and magnetohydrodynamic theory
• Scaling anisotropy with stationary background field in the near-Sun solar wind turbulence
• Isotropization and Evolution of Energy-Containing Eddies in Solar Wind Turbulence: Parker Solar Probe, Helios 1, ACE, WIND, and Voyager 1