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

• Autores: Pouquet, A.; Brachet, M.-E.; Lee, E.; Mininni, P.; Rosenberg, D.; Uritsky, V.
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Proc. Int. Astron. Union 2010;6(S271):304-316
• Materia: (magnetohydrodynamics:) MHD; (Sun:) solar wind; ISM: magnetic fields; Magnetic fields; Stars: activity; Sun: flares; Turbulence; Waves
• Institución: Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales

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 Alfven 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. © International Astronomical Union 2011.
Fil:Mininni, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.