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Ann. Geophys., 29, 2235-2238, 2011
https://doi.org/10.5194/angeo-29-2235-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
07 Dec 2011
First detection of the O III 495.8911 and 500.6843 nm lines in the Earth's upper atmosphere
O. Witasse1, T. Slanger2, and R. Thissen3 1Research and Scientific Support Department of the European Space Agency, ESTEC, Noordwijk, The Netherlands
2Molecular Physics Laboratory, SRI International, Menlo Park, CA, USA
3UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, 38041, France
Abstract. We report the first detection of two emission lines of the atomic oxygen doubly-charged ion at 495.8911 and 500.6843 nm in the terrestrial upper atmosphere. They correspond to the transitions 1D2-3P1 and 1D2-3P2 of the O++ ion, respectively. The measurements were performed on 30 October 2003 during the "Halloween" storms, with the Ultraviolet and Visual Echelle Spectrograph (UVES) mounted on the Very Large Telescope (VLT) in Chile. The intensities of these emissions are ~70 mRayleigh, and ~260 mRayleigh, respectively. These emissions constitute a new diagnostic of the state of the ionosphere.

Citation: Witasse, O., Slanger, T., and Thissen, R.: First detection of the O III 495.8911 and 500.6843 nm lines in the Earth's upper atmosphere, Ann. Geophys., 29, 2235-2238, https://doi.org/10.5194/angeo-29-2235-2011, 2011.
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