  The commonly observed jets provide critical information on the small-scale
energy release in the solar atmosphere. We report a near disk-center jet on
2010 July 20, observed by the Solar Dynamics Observatory. In this event, the
standard interchange magnetic reconnection between an emerging flux spanning 9
x 10^3 km and ambient open fields is followed by a blowout-like eruption. In
the "standard" stage, as the emerging negative element approached the nearby
positive network fields, a jet with a dome-like base in EUV grew for 30 minutes
before the jet spire began to migrate laterally with enhanced flux emergence.
In the "blowout" stage, the above converging fields collided and the subsequent
cancellation produced a UV microflare lasting seven minutes, in which the dome
of the jet seemed to be blown out as (1) the spire swung faster and exhibited
an unwinding motion before vanishing, (2) a rising loop and a blob erupted
leaving behind cusped structures, with the blob spiraling outward in
acceleration after the flare maximum, and (3) ejecting material with a
curtain-like structure at chromospheric to transition-region temperatures also
underwent a transverse motion. It is thus suggested that the flare reconnection
rapidly removes the outer fields of the emerging flux to allow its twisted core
field to erupt, a scenario favoring the jet-scale magnetic breakout model as
recently advocated by Moore et al. in 2010.
