Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..271..304p&link_type=abstract
Astrophysical Dynamics: From Stars to Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 271,
Astronomy and Astrophysics
Astrophysics
Turbulence, Magnetic Fields, (Magnetohydrodynamics:) Mhd, Waves, Sun: Flares, (Sun:) Solar Wind, Stars: Activity, Ism: Magnetic Fields
Scientific paper
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.
Brachet Marc-Etienne
Lee Edward
Mininni Pablo
Pouquet Annick
Rosenberg Duane
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