OGO-IV Ultraviolet Airgiow Spectrometer

Abstract
The OGO-IV ultraviolet airglow spectrometer, which measures the earth's spectrum between 1100 and 3400 Å, consists of an Ebert-Fastie monochromator and two photomultipliers with wide-dynamic range electronics. The cesium telluride photomultiplier channel measures the backscattered ultraviolet daylight between 1750 and 3400 Å over a dynamic range of 10 with a spectral resolution of 20 Å. The cesium iodide photomultiplier channel measures air-glow emission lines between 1100 and 1750 Å, even with the fully illuminated earth for a background.

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