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We follow up on the Sterling et al (2015) discovery that nearly all polarcoronal X-ray jets are made by an explosive eruption of closed magnetic fieldcarrying a miniature filament in its core. In the same X-ray and EUV moviesused by Sterling et al (2015), we examine the onset and growth of the drivingmagnetic explosion in 15 of the 20 jets that they studied. We find evidencethat: (1) in a large majority of polar X-ray jets, the runawayinternal/tether-cutting reconnection under the erupting minifilament flux ropestarts after both the minifilaments rise and the spire-producingexternal/breakout reconnection have started and (2) in a large minority, (a)before the eruption starts there is a current sheet between the explosiveclosed field and the ambient open field, and (b) the eruption starts withbreakout reconnection at that current sheet. The variety of event sequences inthe eruptions supports the idea that the magnetic explosions that make polarX-ray jets work the same way as the much larger magnetic explosions that make aflare and coronal mass ejection (CME). That idea, and recent observationsindicating that magnetic flux cancelation is the fundamental process thatbuilds the field in and around the pre-jet mininfilament and triggers thatfields jet-driving explosion, together suggest that flux cancelation inside themagnetic arcade that explodes in a flare/CME eruption is usually thefundamental process that builds the explosive field in the core of the arcadeand triggers that fields explosion.

Onset of the magnetic explosion in solar polar coronal X-ray jets