Volume 96, Number 5, December 2011
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||24 November 2011|
Time decorrelation in isotropic magnetohydrodynamic turbulence
Dipartimento di Fisica, Università della Calabria - I-87036 Cosenza, Italy, EU
2 IPCF/CNR, Universitá della Calabria - I-87036 Cosenza, Italy, EU
3 Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA/CONICET - Buenos Aires 1428, Argentina
4 Department of Physics and Astronomy, University of Delaware - Newark, DE 19716, USA
Accepted: 19 October 2011
Time decorrelation in isotropic incompressible magnetohydrodynamic (MHD) turbulence is studied using three-dimensional numerical simulation. Eulerian and wavenumber-dependent correlation functions are obtained. Scaling with wavenumber separates effects of nonlinear distortion and effects of random sweeping and Alfvénic wave propagation. Results show that the dominant effect is the combined influence of convective sweeping and Alfvénic propagation, both being nonlocal effects on small-scale fluctuations by large-scale fluctuations. This conclusion finds applications in space plasma observation, particle scattering, predictability, and turbulence theory.
PACS: 52.35.Ra – Plasma turbulence / 52.30.Cv – Magnetohydrodynamics (including electron magnetohydrodynamics) / 52.65.Kj – Magnetohydrodynamic and fluid equation
© EPLA, 2011
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