  We report a solar jet phenomenon associated with successive flares on
November 10th 2014. These explosive events were involved with the satellite
spots' emergence around a delta-type sunspot in the decaying active region NOAA
12205. The data of this jet was provided by Solar Dynamic Observatory (SDO),
X-Ray Telescope (XRT) aboard Hinode, Interface Region Imaging Spectrograph
(IRIS) and Domeless Solar Telescope (DST) at Hida Observatory, Kyoto
University. These plentiful data enabled us to present this series of papers to
discuss the entire processes of the observed phenomena including the energy
storage, event trigger, and energy release. In this paper, we focus on the
energy build-up and trigger phases, by analyzing the photospheric horizontal
flow field around the active region with an optical flow method. The analysis
reveals the following three. (i) The observed explosive phenomena involved
three satellite spots, the magnetic fluxes of which successively reconnected
with their pre-existing ambient fields. (ii) All of these satellite spots
emerged in the moat region of a pivotal delta-type sunspot, especially near its
convergent boundary with the neighboring supergranules or moat regions of
adjacent sunspots. (iii) Around the jet ejection site, the positive polarities
of satellite spot and adjacent emerging flux encountered the global magnetic
field with negative polarity in the moat region of the pivotal delta-type
sunspot, and thus the polarity inversion line was formed along the convergent
boundary of the photospheric horizontal flow channels.
