EUV observations of the equatorial aurora

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Auroras, Equatorial Atmosphere, Far Ultraviolet Radiation, Magnetic Equator, Spaceborne Telescopes, Apollo Soyuz Test Project, Background Radiation, Earth Observations (From Space), Energetic Particles, Helium, Nitrogen, Oxygen Spectra, Ring Currents, Spectral Energy Distribution

Scientific paper

Using the Apollo-Soyuz mission's extreme ultraviolet telescope, it proved possible to observe the equatorial aurora on four different occasions. The observations were made from 220 km in quiet geomagnetic conditions. In all cases, signals were well above ambient background in the 50 to 150 A, 114 to 150 A, 170 to 600 A, and 500 to 780 A bands. The existence of a strong feature in the 50 to 150 A region may be an indication that other elements besides helium - possibly oxygen and nitrogen - contribute to the enhancement.

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