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Observations of coronal jets increasingly suggest that local fragmentationand intermittency play an important role in the dynamics of these events. Inthis work we investigate this fragmentation in high-resolution simulations ofjets in the closed-field corona. We study two realizations of theembedded-bipole model, whereby impulsive helical outflows are driven byreconnection between twisted and untwisted field across the domed fan plane ofa magnetic null. We find that the reconnection region fragments following theonset of a tearing-like instability, producing multiple magnetic null pointsand flux-rope structures within the current layer. The flux ropes formed withinthe weak-field region in the center of the current layer are associated with"blobs" of density enhancement that become filamentary threads as the fluxropes are ejected from the layer, whereupon new flux ropes form behind them.This repeated formation and ejection of flux ropes provides a naturalexplanation for the intermittent outflows, bright blobs of emission, andfilamentary structure observed in some jets. Additional observationalsignatures of this process are discussed. Essentially all jet models invokereconnection between regions of locally closed and locally open field as thejet-generation mechanism. Therefore, we suggest that this repeated tearingprocess should occur at the separatrix surface between the two flux systems inall jets. A schematic picture of tearing-mediated jet reconnection in threedimensions is outlined.

Three-Dimensional Simulations of Tearing and Intermittency in Coronal Jets