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

Using Coronal Cells to Infer the Magnetic Field Structure and Chirality of Filament Channels