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MAGNETOHYDRODYNAMIC TURBULENCE PRODUCED BY RECONNECTION INSTABILITY

Marco Onofri
Dipartimento di Fisica, Universita della Calabria, via P. Bucci, 87036 Rende (CS), Italy

Leonardo Primavera
Fluid Dynamics Laboratory, Universita della Calabria, Via P. Bucci, Cubo 42b, 87036 Rende (Cosenza), Italy

Pierluigi Veltri
Dipartimento di Fisica, Universita della Calabria, via P. Bucci, 87036 Rende (CS), Italy

Francesco Malara
Dipartimento di Fisica, Universita della Calabria, via P. Bucci, 87036 Rende (CS), Italy

Abstrakt

We present numerical simulations of incompressible magnetohydrodynamics for the study of the nonlinear evolution of three-dimensional reconnection instabilities in a configuration where a guide field is present and many resonant surfaces are simultaneously excited in different locations of the simulation domain. The behavior of the system is different from the case when only an antiparallel magnetic field is present. We observe coalescence of magnetic islands and the formation of an anisotropic energy spectrum, which is more developed in the direction perpendicular to the local equilibrium magnetic field. The characteristics of the turbulence is different from magnetohydrodynamic turbulence with a uniform average magnetic field.