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Double-decker filaments and their eruptions have been widely observed inrecent years, but their physical formation mechanism is still unclear. Usinghigh spatiotemporal resolution, multi-wavelength observations taken by the NewVacuum Solar Telescope and the Solar Dynamics Observatory, we show theformation of a double-decker pair of flux rope system by two successivetether-cutting eruptions in a bipolar active region. Due to the combined effectof photospheric shearing and convergence motions around the active region'spolarity inversion line (PIL), the arms of two overlapping inverse-S-shapedshort filaments reconnected at their intersection, which created a simultaneousupward-moving magnetic flux rope (MFR) and a downward-moving post-flare-loop(PFL) system striding the PIL. Meanwhile, four bright flare ribbons appeared atthe footpoints of the newly formed MFR and the PFL. As the MFR rose, twoelongated flare ribbons connected by a relatively larger PFL appeared on eitherside of the PIL. After a few minutes, another MFR formed in the same way at thesame location and then erupted in the same direction as the first one. Detailedobservational results suggest that the eruption of the first MFR mightexperienced a short pause before its successful eruption, while the second MFRwas a failed eruption. This implies that the two newly formed MFRs might reacha new equilibrium at relatively higher heights for a while, which can beregarded as a transient double-decker flux rope system. The observations canwell be explained by the tether-cutting model, and we propose that twosuccessive confined tether-cutting eruptions can naturally produce adouble-decker flux rope system, especially when the background coronal magneticfield has a saddle-like distribution of magnetic decay index profile in height.

Double-decker Pair of Flux Ropes Formed by Two Successive Tether-cutting Eruptions