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In this paper, we study the onset process of a solar eruption on 21 February2015, focusing on its unambiguous precursor phase. With multi-wavelengthimaging observations from the Atmospheric Imaging Assembly (AIA), definitivetether-cutting (TC) reconnection signatures, i.e., flux convergence andcancellation, bidirectional jets, as well as topology change of hot loops, wereclearly observed below the pre-eruption filament. As TC reconnection progressedbetween the sheared arcades that enveloped the filament, a channel-likemagnetic flux rope (MFR) arose in multi-wavelength AIA passbands wrappingaround the main axis of the filament. With the subsequent ascent of the newbornMFR, the filament surprisingly split into three branches. After a 7-hour slowrise phase, the high-lying branch containing by the MFR abruptly acceleratedcausing a two-ribbon flare; while the two low-lying branches remained stableforming a partial eruption. Complemented by kinematic analysis and decay indexcalculation, we conclude that TC reconnection played a key role in building upthe eruptive MFR and triggering its slow rise. The onset of the torusinstability may have led the high-lying branch into the standard eruptionscenario in the fashion of a catastrophe.

Witnessing tether-cutting reconnection at the onset of a partial eruption