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Using 2-dimensional (2D) magnetohydrodynamics (MHD) simulations, we show thatPetschek-type magnetic reconnection can be induced using a simple resistivitygradient in the reconnection outflow direction, revealing the key ingredient ofsteady fast reconnection in the collisional limit. We find that the diffusionregion self-adjusts its half-length to fit the given gradient scale ofresistivity. The induced reconnection x-line and flow stagnation point alwaysreside within the resistivity transition region closer to the higherresistivity end. The opening of one exhaust by this resistivity gradient willlead to the opening of the other exhaust located on the other side of thex-line, within the region of uniform resistivity. Potential applications ofthis setup to reconnection-based thrusters and solar spicules are discussed. Ina separate set of numerical experiments, we explore the maximum plausiblereconnection rate using a large and spatially localized resistivity right atthe x-line. Interestingly, the resulting current density at the x-line dropssignificantly so that the normalized reconnection rate remains bounded by thevalue $\simeq 0.2$, consistent with the theoretical prediction.

Fast Magnetic Reconnection induced by Resistivity Gradients in 2D Magnetohydrodynamics