  We analysed Interface-Region Imaging Spectrograph (IRIS) and the Solar
Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations of a
small coronal jet that occurred at the solar west limb on 2014 August 29. The
jet source region, a small bright point, was located at an active-region
periphery and contains a fan-spine topology with a mini-filament. Our analysis
has identified key features and timings that motivate the following
interpretation of this event. As the stressed core flux rises, a current sheet
forms beneath it; the ensuing reconnection forms a flux rope above a flare
arcade. When the rising filament-carrying flux rope reaches the stressed null,
it triggers a jet via explosive interchange (breakout) reconnection. During the
flux-rope interaction with the external magnetic field, we observed brightening
above the filament and within the dome, along with a growing flare arcade. EUV
images reveal quasi-periodic ejections throughout the jet duration with a
dominant period of 4 minutes, similar to coronal jetlets and larger jets. We
conclude that these observations are consistent with the magnetic breakout
model for coronal jets.
