Complete replacement of magnetic flux in a flux rope during a coronal mass ejection

Solar coronal mass ejections are the most energetic events in System. In their standard formation model, a magnetic flux rope builds up into ejection through reconnection that continually converts overlying, untwisted twisted enveloping pre-existing rope. However, only minority of carry coherent as core structure, which casts doubt on universality this orderly wrapping process. Here we provide observational evidence different and eruption mechanism from an S-shaped thread, where its is fully replaced via flare reconnections. One footpoints sigmoidal feature slipped expanded during formation, then moved to completely new place, associated with highly dynamical evolution ribbons twofold increase footpoint, eruption. Such configuration not predicted by models or numerical simulations highlights three-dimensional nature reconnections between surrounding field.