The isotopic oxygen nightglow as viewed from Mauna Kea.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth Atmosphere: Airglow

Scientific paper

Optical spectra of the terrestrial nightglow in the 520- to 900-nm region, as measured by the W.M. Keck telescope on Mauna Kea in Hawaii and the associated high-resolution echelle spectrograph, showed many bands belonging to the important O2(b-X) atmospheric band emission system. Previous ground-based measurements have shown only a single band, from the lowest vibrational level of the emitting state. Of particular interest is the fact that at the 762-nm position of the b-X 0-0 band, where earlier studies have shown only absorption features, these results showed both absorption at the 16O16O line positions and well-resolved emission at the positions of many of the 18O16O and 17O16O lines. These findings show that substantial advances can be made in understanding atmospheric emission phenomena by the use of astronomical tools.

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