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A form of airglow, similar to the better-known nightglow, but stronger and with more emission lines. It is difficult to study because of the dominance of the far more intense scattered daylight, but observations are made by polar-orbiting satellites. There are oxygen bands in the infrared, bands from various nitrogen species (N2, N2+, NO) in the ultraviolet, and oxygen, nitrogen, and hydrogen emissions at far-ultraviolet wavelengths.

Subjects: Meteorology and Climatology.

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