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We compare the location of the polar cap boundary (PCB) determined using twodifferent techniques, and use them as proxies for the open-closed field lineboundary (OCB). Electron temperatures from observations of the EISCAT radarfacility are used to estimate the latitude of the PCB along the meridian ofthe EISCAT VHF beam. The second method utilizes global images of protonaurora obtained by the IMAGE satellite FUV SI12 instrument. These methodsare applied to three different intervals. In two events, the agreementbetween the methods is good and the mean of the difference is within theresolution of the observations. In a third event, the PCB estimated fromEISCAT data is located several degrees poleward of that obtained from theIMAGE FUV SI12 instrument. Comparison of the reconnection electric fieldestimated from the two methods shows that high-resolution measurements bothin time and space are needed to capture the variations in reconnectionelectric field during substorm expansion. In addition to the two techniquesintroduced above to determine the PCB location, we also use a search for thelocation of the reversal of the east-west component of the equivalentcurrent known as the magnetic convection reversal boundary (MCRB). The MCRBfrom the MIRACLE magnetometer chain mainly follows the motion of the polarcap boundary during different substorm phases, but differences arise nearthe Harang discontinuity

Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations