Transient magnetic reconnection and unstable shear layers

We study three-dimensional magnetic reconnection caused by the Kelvin-Helmh oltz (KH) instability and differential rotation in subsonic and sub-Alfveni c flows. The flows, which are modeled by the resistive magnetohydrodynamic equations with constant resistivity, are stable in the direction of the mag netic field but unstable perpendicular to the magnetic field. Localized tra nsient reconnection is observed on the KH time scale, and kinetic energy in creases with decreasing resistivity. As in flux-transfer events in the Eart h's magnetopause boundary layer, bipolar structures in the normal flux and bidirectional jetting away from reconnection zones are observed.