Magnetic fields from Multiplicative Chaos

Autor:	Durrive, J. -B., Lesaffre, P., Ferrière, K.
Rok vydání:	2020
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - Solar and Stellar Astrophysics Physics - Fluid Dynamics Physics - Plasma Physics
Druh dokumentu:	Working Paper
DOI:	10.1093/mnras/staa1514
Popis:	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. Comment: 22 pages, 9 figures, Accepted for publication in MNRAS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2005.11972 Zobrazit plný text záznamu View this record from Arxiv