Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..429...28m&link_type=abstract
Numerical Modeling of Space Plasma Flows, Astronum-2009, proceedings of a conference held 29 June through 3 July 2009 in Chamoni
Astronomy and Astrophysics
Astronomy
Scientific paper
It is shown that supposedly universal scaling relations between second-order statistical moments of magnetohydrodynamic turbulence can be found with the help of the eddy-damped quasi-normal statistical closure theory (EDQNM). As an example, the inertial range scaling behaviour of the spectrum of magnetic helicity in direct numerical simulations of three-dimensional magnetohydrodynamic turbulence driven at small scales is theoretically studied. Using a hypothesis of dynamical equilibrium the inertial range spectrum is found to depend on various quantities: kinetic and magnetic energy as well as kinetic helicity. The influence of kinetic helicity explains numerical results that are in apparent contradiction to previous theoretical and numerical work. A similar approach towards the residual energy spectrum in magnetohydrodynamic turbulence is also touched upon.
Malapaka S. K.
Muller Werner
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