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Joint observations of the all-sky camera at Resolute Bay (Nunavut, Canada)and the Polar Dual Auroral Radar Network (PolarDARN) HF radars at RankinInlet and Inuvik (Canada) are considered to establish radar signatures ofpoleward moving polar cap arcs "detaching" from the auroral oval. Commonfeatures of the events considered are enhanced power or echo occurrence inthe wake of the arcs and enhanced spectral width of these echoes. When thearcs were oriented along some of the radar beams, velocity reversals at thearc location were observed with the directions of the arc-associated flowscorresponding to a converging electric field. For the event of 9 December2007, two arcs were poleward progressing almost along the central beams ofthe Inuvik radar at the speed close to the E × Bdrift of the bulk of the F-region plasma as inferred from HF Dopplervelocities and from independent measurements by the Resolute Bay ionosonde.In global-scale convection maps inferred from all Super Dual Auroral RadarNetwork (SuperDARN) radar measurements, the polar cap arcs were often seenclose to the reversal line of additional mesoscale convection cells locatedpoleward of the normal cells related to the auroral oval

Signatures of moving polar cap arcs in the F-region PolarDARN echoes