  We study the dynamics and topology of an emerging magnetic flux concentration
using high spatial resolution spectropolarimetric data acquired with the
Imaging Magnetograph eXperiment on board the Sunrise balloon-borne solar
observatory. We obtain the full vector magnetic field and the line-of-sight
(LOS) velocity through inversions of the Fe I line at 525.02 nm with the SPINOR
code. The derived vector magnetic field is used to trace magnetic field lines.
Two magnetic flux concentrations with different polarity and LOS velocities are
found to be connected by a group of arch-shaped magnetic field lines. The
positive polarity footpoint is weaker (1100 G) and displays an upflow, while
the negative polarity footpoint is stronger (2200 G) and shows a downflow. This
configuration is naturally interpreted as a siphon flow along an arched
magnetic flux tube.
