An anomalous low-latitude phenomenon observed by the OGO 6 UV photometer between 400 and 800 km

Physics

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Airglow, Equatorial Atmosphere, Lyman Alpha Radiation, Ogo-6, Tropical Regions, Ultraviolet Photometry, Energetic Particles, Magnetic Storms, Magnetoactivity, Statistical Analysis, Zenith

Scientific paper

The polar-orbiting OGO-6 zenith viewing UV photometer was designed to measure the high-altitude airglow in the zenith at heights between 400 and 1100 km. The spectral features (Ly alpha H I 1216 A and the O I 1304-A triplet) observed have been used to infer the densities atomic hydrogen and atomic oxygen at 400 to 1100 km. However during periods where the perigee was at low latitudes, significant localized increases in apparent intensity were recorded above the normal Lyman alpha airglow signal. Their large intensities and their high altitude of occurrence make it unlikely that the instrument was recording UV emission. The morphology of the occurrence of these mainly quiet time events points to the possibility of direct charged particle interference.

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