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Noxon 1975
Noxon, J.F. (1975). Twilight enhancement in O2(b1Sg) airglow emission. Journal of Geophysical Research 80. doi: 10.1029/JA080i010p01370. issn: 0148-0227.

The (0,1) band of the atmospheric system of O2(b1&Sgr;g-X3&Sgr;g) at 8640 ¿ exhibits a large enhancement at twilight; the morning enhancement greatly exceeds that in the evening. Some contribution to the enhancement arises from fluorescent scattering of sunlight by O2 in the 80- to 100-km region. Of comparable strength in the evening, but wholly dominant in the morning, is production of O2(1&Sgr;) by energy transfer from O(1D) produced in ozone photolysis within the same altitude region. The mesospheric ozone density can thereby de determined up to at least 100 km; at dawn the ozone density at 100 km approaches 108 cm-3, well above that predicted in some recent model calculations.

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Journal of Geophysical Research
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