Space-time statistics of isotropic MHD turbulence: the role of the sweeping effect

DMITRUK, P., SERVIDIO, S.,CARBONE, V., MATTHAEUS, W.H.

Conferencia; American Geophysical Union, Fall Meeting 2010; 2010

Using direct numerical simulations of three-dimensional isotropic Magnetohydrodynamics, the scaling properties of two-point and two-time correlations are investigated. A large scale forcing is imposed and, when a turbulent steady state is reached, the dominant processes in the time decorrelation of the small-scale fluctuations are studied. In particular, the role of the sweeping, due to the motion of large scale eddies, is investigated. Results are also compared with previous studies in hydrodynamics. A possible link between spatial intermittency and bursty Eulerian signals is considered as well.