Parametric description of intermittent probability distribution functions in solar wind and magnetohydrodynamic turbulence

In this work, we find empirical evidence that the scale-dependent statistical properties of solar wind and magnetohydrodynamic (MHD) turbulence can be described in terms of a family of parametric probability distribution functions (PDFs) known as Normal Inverse Gaussian (NIG). Understanding these PD...

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Vydané v:Monthly notices of the Royal Astronomical Society Ročník 531; číslo 1; s. 24 - 34
Hlavní autori: Palacios, Juan C, Perez, Jean C, Bourouaine, Sofiane
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Oxford University Press 01.06.2024
Predmet:
Distribution functions
Empirical analysis
High resolution
Magnetic properties
Magnetohydrodynamic turbulence
Normal distribution
Parameters
Probability distribution
Probability distribution functions
Solar wind
Statistical analysis
MHD
turbulence
solar wind
ISSN:0035-8711, 1365-2966
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Shrnutí:In this work, we find empirical evidence that the scale-dependent statistical properties of solar wind and magnetohydrodynamic (MHD) turbulence can be described in terms of a family of parametric probability distribution functions (PDFs) known as Normal Inverse Gaussian (NIG). Understanding these PDFs is one of the most important goals in turbulence theory, as they are inherently connected to the intermittent properties of solar wind turbulence. We investigate the properties of PDFs of Elsasser increments based on a large statistical sample from solar wind observations and high-resolution numerical simulations of MHD turbulence. In order to measure the PDFs and their corresponding properties, three experiments are presented: fast and slow solar wind for experimental data and a simulation of reduced MHD (RMHD) turbulence. Conditional statistics on a 23-yr-long sample of WIND data near 1 au and high-resolution pseudo-spectral simulation of steadily driven RMHD turbulence on a $2048^3$ mesh are used to construct scale-dependent PDFs. The empirical PDFs are fitted to NIG distributions, which depend on four free parameters. Our analysis shows that NIG distributions accurately capture the evolution of the PDFs, with scale-dependent parameters, from large scales characterized by a Gaussian distribution, turning to exponential tails within the inertial range and stretched exponentials at dissipative scales. We also show that empirically-measured NIG parameters exhibit well-defined scaling properties that are similar across the three empirical data sets, which may be indicative of universal behaviour.
Bibliografia:ObjectType-Article-1
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USDOE
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stae1065