Nonlinear dynamics of inviscid reduced MHD plasmas: the appearance of Quasi-Single-helicity states.
The nonlinear dynamics of an inviscid magnetohydrodynamic system in a low-beta plasma is investigated through a simplified model obtained by a Galerkin projection. We show that a single Fourier mode dominates over the whole energy spectrum, a self-organization mechanism of turbulence being responsible for this nonlinear effect. Our results are in agreement with observations of an analogous phenomenon, say, the emergence of a quasi-single-helicity state both in numerical simulations and real experiments in reversed field pinch laboratory plasmas.
Servidio
Sergio
S
Dipartimento di Fisica and Istituto Nazionale di Fisica della Materia, Unitá di Cosenza, Ponte Pietro Bucci, Rende (CS), Italy.
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