One of the instruments operated during the successful Swedish Viking satellite mission of 1986 was an Ultraviolet Imager contributed by Canada. The camera provided global images of the aurora with exposure times of about one second and repetition rates of one to three per minute. This time resolution was achieved using the combination of a fast (f/1) camera, an image intensifier and a coupled CCD detector operated in the time-delay-integration (TDI) mode to "de-spin" the instrument. Interactive control and real-time analysis of data were integral parts of the instrument design. The instrument provided approximately 45,000 images. Based upon the Viking experience, a new UV imager is being developed for the Auroral Probe satellite of the Soviet Union's multi-satellite Interball program.