Observation of the O I ultraviolet intercombination emissions in the terrestrial dayglow

Details Observation of the O I ultraviolet intercombination emissions in the terrestrial dayglow Observation of the O I ultraviolet intercombination emissions in the terrestrial dayglow

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..239b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 239-245.

Computer Science

Sound

10

Atmospheric Radiation, Dayglow, Emission Spectra, Oxygen Ions, Ultraviolet Spectra, Ultraviolet Spectroscopy, Electron Flux Density, Line Spectra, Sounding Rockets

Scientific paper

Spectroscopic observations have been made of the terrestrial ultraviolet dayglow (850 - 1850 Å) using newly developed instrumentation in a sounding rocket payload. The atmospheric conditions and viewing geometry were such as to suppress nitrogen emissions relative to those from atomic oxygen. This permitted the identification and measurement of the weak O I 1173-Å (3sarcmin 3D0 - 2p4 1D) intercombination multiplet and the 1641-Å (3s 3S0 - 2p4 1D) line as well as the strong 989-Å and 1304-Å emissions. The 1173-Å emission rate increased at lower altitudes, while the 989-Å emission, from the same upper level, decreased at lower altitudes. This behavior is consistent with the radiative entrapment model of Meier (1982) and the laboratory value of the 1173-Å/989-Å branching ratio of 1.5×10-4 (Morrison, 1985). The 1641-Å/1304-Å emission ratio is also consistent with a radiative entrapment model and a branching ratio near 5.0×10-6. Lack of detection of the 1484-Å (3sarcmin 3D10 - 2p4 1S0) intercombination line allows an upper limit to be placed on the 1484-Å branching ratio, confirming that emission in this line is less significant in depleting the 3sarcmin 3D0 term than is 1173-Å emission.

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