  We report on the Atmospheric Imaging Assembly (AIA) observations of plasma
outflows originating in a coronal dimming during the 2015 April 28th filament
eruption. After the filament started to erupt, two flare ribbons formed, one of
which had a well-visible hook enclosing a core (twin) dimming region. Along
multiple funnels located in this dimming, a motion of plasma directed outwards
started to be visible in the 171 and 193 filter channels of the instrument. In
time-distance diagrams, this motion generated a strip-like pattern, which
lasted for more than five hours and which characteristics did not change along
the funnel. We therefore suggest the motion to be a signature of outflows
corresponding to velocities ranging between $\approx70$ and 140 km s$^{-1}$.
Interestingly, the pattern of the outflows as well as their velocities were
found to be similar to those we observed in a neighboring ordinary coronal
hole. Therefore, the outflows were most likely a signature of a CME-induced
slow solar wind flowing along the open-field structures rooted in the dimming
region. Further, the evolution of the hook encircling the dimming region was
examined in the context of the latest predictions imposed for the
three-dimensional magnetic reconnection. The observations indicate that the
filament's footpoints were, during their transformation to the dimming region,
reconnecting with surrounding canopies. To our knowledge, our observations
present the first imaging evidence for outflows of plasma from a dimming
region.
