Simultaneous measurements of auroral intensities from below and above the emitting layer can be used to verify imager orientation and mapping procedures for satellite auroral images, determine auroral height by stereoscopic methods, and deduce incident particle characteristics. A data reduction approach that achieves optimal spatial and temporal matching of ground and space data sets is presented. We investigate a January 25, 1987, case study of a bright auroral arc using a meridian scanning photometer and an all-sky camera located at Rabbit Lake, Saskatchewan, and a space imager (AIRS of Polar BEAR). The ground and space latitudinal profiles of arc intensity match best for a peak deposition height of 122¿7 km. Theoretical calculations indicates that the observed FUV intensities are due to electrons of average energy 3.1¿1.1 keV and a total energy flux of 5.7¿1.5 ergs cm-2 s-1. ¿ American Geophysical Union 1993