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Recent studies have revealed that solar jets involving minifilament eruptionsmay be initiated under the well-known magnetic-breakout mechanism. Before orjust at the onset of those jets, there should be a current sheet, wherebreakout magnetic reconnection takes place, between open fields and the outsideof the jet-base arcade carrying minifilament in its core. In this paper wepresent a jet produced by eruption of two minifilaments lying at the jet base.A current sheet is directly detected near the jet base before the onset of theeruption, suggesting the magnetic-breakout mechanism. However, we further findthat the current sheet undergoes a transition. The current sheet first shortensto zero in length, but then lengthens towards an orthogonal direction relativeto its initial orientation. The change of the current sheet gives rise to areversal of the breakout reconnection, as the inflow and outflow regions beforethe transition become the outflow and inflow regions after the transition,respectively. We therefore propose that this observation provides evidence forthe so-called oscillatory reconnection which is defined by a series ofreconnection reversals but not yet proved to exist in real plasma environmentof the solar atmosphere.

Observation of a reversal of breakout reconnection preceding a jet: evidence of oscillatory magnetic reconnection?