Apollo 16 far ultraviolet imagery of the polar auroras, tropical airglow belts, and general airglow

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Airglow, Apollo 16 Flight, Auroral Zones, Far Ultraviolet Radiation, Imaging Techniques, Density Distribution, Earth Atmosphere, Satellite-Borne Instruments, Spatial Distribution, Tropical Regions

Scientific paper

Far-ultraviolet imagery of the earth in the wavelength ranges from 1050 to 1600 A and from 1250 to 1600 A was obtained from the lunar surface during the Apollo 16 mission on Apr. 21, 1972. The images have an angular resolution of about 2 arcmin (230-km linear resolution) and have been quantitatively analyzed to obtain absolute intensities and spatial distributions of the polar auroras (both wavelength ranges), the day and night airglow, and tropical airglow belts (1250-A to 1600-A wavelength range). The observations are consistent with previous results obtained from the OGO-4 spacecraft, but they have also provided details on the spatial distributions of the various emissions over an entire hemisphere at a single time. A general night airglow, at least in the Northern Hemisphere, is indicated.

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