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Lack of universality in MHD turbulence, and the possible emergence of a new paradigm?

Published online by Cambridge University Press:  12 August 2011

Annick Pouquet ,
Marc-Etienne Brachet ,
Ed Lee ,
Pablo Mininni ,
Duane Rosenberg  and
Vadim Uritsky
Annick Pouquet
Affiliation:
Geophysical Turbulence Program, National Center for Atmospheric Research, PO Box 3000, Boulder CO 80304USA email: pouquet@ucar.edu and duaner@ucar.edu
Marc-Etienne Brachet
Affiliation:
École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France email: brachet@physique.ens.fr
Ed Lee
Affiliation:
Centrum voor Plasma-Astrofysica, Departement Wiskunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium email: edlee@ucar.edu
Pablo Mininni
Affiliation:
Geophysical Turbulence Program, National Center for Atmospheric Research, PO Box 3000, Boulder CO 80304USA email: pouquet@ucar.edu and duaner@ucar.edu Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina email: mininni@df.uba.ar
Duane Rosenberg
Affiliation:
Geophysical Turbulence Program, National Center for Atmospheric Research, PO Box 3000, Boulder CO 80304USA email: pouquet@ucar.edu and duaner@ucar.edu
Vadim Uritsky
Affiliation:
Physics and Astronomy Department, University of Calgary, Calgary, AB T2N1N4Canada email: uritsky@ucalgary.ca
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Abstract

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We review some of the recent results obtained in MHD turbulence, as encountered in many astrophysical objects. We focus attention on the lack of universality in such flows, including in the simplest case (no externally imposed magnetic field, no forcing, unit magnetic Prandtl number). Several parameters can foster such a breakdown of classical Kolmogorov scaling, such as the presence of velocity-magnetic field correlations, or of magnetic helicity and the role of the interplay between nonlinear eddies and Alfvén waves. A link with avalanche processes is also discussed. These findings have led to the conjecture of the emergence of a new paradigm for MHD turbulence, as a possibly unsettled competition between several dynamical phenomena.

Keywords

turbulencemagnetic fields(magnetohydrodynamics:) MHDwavesSun: flares(Sun:) solar windstars: activityISM: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 304 - 316
Copyright
Copyright © International Astronomical Union 2011

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