Abstract
The nonlinear dynamics of magnetoacoustic and Alfvén-type magnetohydrodynamic (MHD) perturbations in structurally unstable magnetic configurations is studied analytically and numerically. The nonlinear evolution of the perturbed electric current turns structurally unstable configurations into structurally stable ones. This transformation is forbidden in the framework of the ideal MHD equations, but can occur in the process of magnetic field line reconnection. MHD simulations of the transformation of configurations with two null lines (X-lines) under perturbations imposed from the boundaries show that the change in the magnetic field topology due to the magnetoacoustic perturbations is accompanied by the redistribution of the electric current curried by the Alfvén perturbations.
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