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Results from 2.5D and 3D studies of the onset and development of the tearinginstability are presented, using high fidelity resistive MHD simulations. Alimited parameter study of the strength of the reconnecting field (or shearangle) was performed. An initially simple 1D equilibrium was used, consistingof a modified force-free current sheet, with periodic boundary conditions inall directions. In all cases, the linear and non-linear evolution led to aprimary current sheet between two large flux ropes. The global reconnectionrate during this later stage was analyzed in all simulations. It was found thatin 2.5D the primary current sheet fragmented due to plasmoids, and as expected,the global reconnection rate, calculated using multiple methods, increases withthe strength of the reconnecting field due to a stronger Alfv\'{e}n speed. In3D, the presence of interacting oblique modes of the tearing instabilitycomplicates the simple 2.5D picture, entangling the magnetic field of theinflow and introducing a negative effect on the reconnection rate. The twocompeting effects of stronger Alfv\'{e}n speed and entangling, which bothincrease with the strength of the reconnecting field, resulted in a decrease inthe reconnection rate with increasing reconnecting field. For all simulations,the 3D rates were less than in 2.5D, but suggest that as one goes to weakreconnecting field (or strong guide field), the system becomes more 2.5D likeand the 2.5D and 3D rates converge. These results have relevance to situationslike nano-flare heating and flare current sheets in the corona.

Impact of 3D Structure on Magnetic Reconnection