Magnetic fields from Multiplicative Chaos - Archive ouverte HAL
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society: Letters Année : 2020

Magnetic fields from Multiplicative Chaos

Résumé

An analytical model for fully developed three-dimensional incompressible turbulence was recently proposed in the hydrodynamics community, based on the concept of multiplicative chaos. It consists of a random field represented by means of a stochastic integral, which, with only a few parameters, shares many properties with experimental and numerical turbulence, including in particular energy transfer through scales (the cascade) and intermittency (non-Gaussianity) which is most conveniently controlled with a single parameter. Here, we propose three models extending this approach to MHD turbulence. Our formulae provide physically motivated 3D models of a turbulent velocity field and magnetic field coupled together. Besides its theoretical value, this work is meant to provide a tool for observers: a dozen of physically meaningful free parameters enter the description, which is useful to characterize astrophysical data.
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Dates et versions

hal-03021347 , version 1 (24-11-2020)

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Jean-Baptiste Durrive, Pierre Lesaffre, Katia Ferrière. Magnetic fields from Multiplicative Chaos. Monthly Notices of the Royal Astronomical Society: Letters, 2020, 496 (3), ⟨10.1093/mnras/staa1514⟩. ⟨hal-03021347⟩
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