Co-variation of nightglow emission from the O2(A3Σu+) and O2(c1Σu-) states and the oxygen green line, observed with the Keck I/II telescopes

Details Co-variation of nightglow emission from the O2(A3Σu+) and O2(c1Σu-) states and the oxygen green line, observed with the Keck I/II telescopes Co-variation of nightglow emission from the O2(A3Σu+) and O2(c1Σu-) states and the oxygen green line, observed with the Keck I/II telescopes

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..617s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 6-9, p. 617-622.

Physics

2

Sky Spectra, Oxygen Emission, Green Line, Nightglow

Scientific paper

Sky spectra from the Keck I and II telescopes on Mauna Kea, Hawai'i reveal the terrestrial nightglow in unprecedented detail. We have recently demonstrated that the O2(c1Σu-) state, the upper state of the O2(c-X) Herzberg II bands, also radiates in a new transition, the O2(c-b) system. The c-b bands, by their spectroscopic nature, present a more distinct atmospheric signature than the c-X bands. The question often arises as to whether the three O2 Herzberg states should be considered a single coupled system or if they react in an independent manner. Particularly relevant is the issue of the mechanism of mesosphere/lower thermosphere oxygen green line production, the current belief being that it is the result of electronic energy transfer from the O2(c) state to oxygen atoms. With the aid of Keck data from the HIRES and the ESI echelle spectrographs it is possible to address these questions. In the 410-440nm region there is relatively strong emission from the Herzberg I (A-X) system and the new c-b system. We present data from March and October, 2000, showing the co-variation of these emissions, and how they correlate with the green line intensity.

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