Ultraviolet imaging of sunlit auroras from HILAT

Computer Science – Sound

Scientific paper

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Auroral Spectroscopy, Ionospheric Sounding, Polar Regions, Satellite-Borne Instruments, Scientific Satellites, Ultraviolet Spectroscopy, Albedo, Daytime, Image Processing, Summer, Vacuum Spectroscopy

Scientific paper

This article reports the first successful attempt to image the global auroral display over the fully sunlit summer polar region by using the vacuum ultraviolet imager on board the recently launched HILAT satellite at an altitude of 800 km. Several daylight auroral images are presented. These images clearly demonstrate that the global auroral display can be imaged under full sunlight conditions. The earth albedo, which is the dayglow background in the ultraviolet, is not a formidable obstacle to global auroral imaging when the proper vacuum ultraviolet wavelengths are used.

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