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Magnetic reconnection is a fundamental plasma process that plays a criticalrole not only in energy release in the solar atmosphere, but also in fusion,astrophysical, and other space plasma environments. One of the challenges inexplaining solar observations in which reconnection is thought to play acritical role is to account for the transition of the dynamics from a slowquasi-continuous phase to a fast and impulsive energetic burst of much shorterduration. Despite the theoretical progress in identifying mechanisms that mightlead to rapid onset, a lack of observations of this transition has left modelspoorly constrained. High-resolution spectroscopic observations from NASA'sInterface Region Imaging Spectrograph (IRIS) now reveal tell-tale signatures ofthe abrupt transition of reconnection from a slow phase to a fast, impulsivephase during UV bursts or explosive events in the Sun's atmosphere. Ourobservations are consistent with numerical simulations of the plasmoidinstability, and provide evidence for the onset of fast reconnection mediatedby plasmoids and new opportunities for remote-sensing diagnostics ofreconnection mechanisms on the Sun.

Observations and modeling of the onset of fast reconnection in the solar transition region