Fig. 1
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Arc-detection algorithm outlined in the text applied to the UVS exemplar image of the northern aurora from perijove 6. A 15°-by-15° grid in System-III longitude and planetocentric latitude is overlain on the aurora. The System-III longitude of certain gridlines are given in white, and the planetocentric latitudes of certain gridlines in magenta. The brightness scale of the images of the aurora in kR is given at the top of (a).
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