Abstract
The extreme ultraviolet telescope on the Apollo‐Soyuz mission observed the equatorial aurora from an altitude of 220 km on four separate occasions in July 1975 in quiet geomagnetic conditions (Ap=6). In all cases signals well above ambient background in the 50 to 150‐Å, 114 to 150‐Å, 170 to 600‐Å, and 500 to 780‐Å bands were recorded as the spacecraft moved across the equator and the instrument viewed the atmosphere below it. The observed emissions are confined to a band roughly 10° to 20° in width, the peak emission occurring in the range ∼ −15° to +2° magnetic latitude. No enhancement in the 1350 to 1550‐Å channel was noted. The observed signals are interpreted as recombination radiation of energetic helium and, possibly, oxygen ions originating in the terrestrial ring current.
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