Multipoint measurements of large DC electric fields and shears in the auroral zone

We present electric field and electron data from the Auroral Turbulence II (AT2) sounding rocket mission. This three payload rocket flew through sever al discrete nightside auroral are structures. The payloads traversed a larg e, stable are structure containing, near its poleward edge, at least 400 mV /m of DC electric field, together with broadband waves in the electric fiel d at frequencies from DC up to 100 Hz. Multipoint measurements allow us to determine the size of this region and to observe that it is characterized b y two distinct variations: a region of spatial shear approximately 1 km in extent across the are, immediately followed by a region of temporal change in electric field, nearly 6 km in extent. The observed broadband waves do n ot show a preference for the spatial shear region over the time varying reg ion.