  Coronal cells are visible at temperatures of ~ 1.2 MK in Fe XII coronal
images obtained from the Solar Dynamics Observatory (SDO) and Solar Terrestrial
Relations Observatory (STEREO) spacecraft. We show that near a filament
channel, the plumelike tails of these cells bend horizontally in opposite
directions on the two sides of the channel like fibrils in the chromosphere.
Because the cells are rooted in magnetic flux concentrations of majority
polarity, these observations can be used with photospheric magnetograms to
infer the direction of the horizontal field in filament channels and the
chirality of the associated magnetic field. This method is similar to the
procedure for inferring the direction of the magnetic field and the chirality
of the fibril pattern in filament channels from H-alpha observations. However,
the coronal cell observations are easier to use and provide clear inferences of
the horizontal field direction for heights up to ~ 50 Mm into the corona.
