A Digital Imaging System For Auroral Processes
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The All-Sky Camera (ASC) system produces images which are used to study auroral processes. The video-cassette recorder-based ASC used by the Institute of Space and Atmospheric Studies at the Rabbit Lake, Saskatchewan field site from 1991 to 1993 produces analog images which did not utilize the full video resolution capabilities of the system. As well, the analog images degraded with repeated playback of the videotape and the images could not be readily sent to scientists at remote locations. As an alternative solution, this thesis describes the development, implementation and results of a digital imaging ASC system for auroral processes. The system is a combination of hardware and software which corrects the problems inherent in the VCR-based system and has the capability to acquire, process and store digital images directly at the field site. The digital images utilize the full video resolution capabilities of the ASC, feature improved signal-to-noise ratio over VCR images and facilitate subsequent ease of post-acquisition image processing by scientists.