Fig. 6From: Relative contributions of large-scale and wedgelet currents in the substorm current wedgeIllustration of upward (red) and downward (blue) currents for events dominated by a the large-scale wedge and b a composite of the large-scale and wedgelet currents. The thin black lines mark the poleward and equatorward auroral boundaries. The thick lines mark bright auroral arcsBack to article page