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- W2048200410 abstract "When the local solar zenith angle, χL, is < 105° the 6300 A line is much stronger than expected on the basis of F region ionic recombination alone. Between 95 and 105° the additional intensity is quantitatively explained by production of O(1D) from photolysis of O2 in the Schumann-Runge continuum, (λλ 1300–1750 A) using current values for solar flux, atmospheric composition and quenching of O(1D) by N2. The Schumann-Runge (SR) component exhibits a large seasonal variation with a maximum in summer. We interpret this variation as implying a seasonal change in thermospheric O2 abundance; the change seems largely to reflect a variation in O2 density at the base of the diffusive regime although some contribution may come from changes in thermospheric temperature structure. Large changes in the SR component exist from day to day and with a 27 day period following a major magnetic storm. The photodissociation source becomes inadequate when xl < 95°; at 90° more than half of the intensity comes from still another source which we identify as local photoelectron excitation of O atoms." @default.
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- W2048200410 date "1972-12-01" @default.
- W2048200410 modified "2023-09-27" @default.
- W2048200410 title "Changes in thermospheric molecular oxygen abundance inferred from twilight 6300 A airglow" @default.
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- W2048200410 doi "https://doi.org/10.1016/0032-0633(72)90068-2" @default.
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