Optical auroral conjugacy: Viking UV Imager - South Pole station ground data

Physics

Scientific paper

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Auroral Zones, Ground Truth, Polar Regions, Satellite Imagery, Ultraviolet Photography, Data Processing, Diurnal Variations, High Resolution, Viking Spacecraft

Scientific paper

High-time-resolution satellite UV images of the northern auroral oval are compared with South Pole station keogram camera and all-sky camera observations to determine the displacement of the South Pole conjugate point from its location calculated using the international geomagnetic reference field magnetic-field model. The results presented extend the study of optical conjugacy to high magnetic latitudes in a solstice period, and to sunlit auroral events. Three high-latitude events were analyzed: a poleward expansion, an arc poleward of the midnight oval, and a substantial movement in the afternoon auroral oval. They were determined to occur on closed field lines. A range of displacement for the South Pole conjugate point of 5.3 deg in latitude and 1.9 hours in MLT was measured.

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