Computer Science – Sound
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3583f&link_type=abstract
Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3583-3588.
Computer Science
Sound
37
Dayglow, Ionospheric Sounding, Oxygen Spectra, Ultraviolet Spectroscopy, Emission Spectra, F Region, Oxygen Ions, Rocket Sounding
Scientific paper
The emission line spectrum of singly ionized atomic oxygen (O II) dominates the day airglow spectrum in the extreme ultraviolet below 834 A. The strongest resonance line, at 834 A, is optically thick and an analysis of height profiles obtained from rocket observations between 140 and 265 km in specific viewing directions indicates that the principal excitation source is direct photoionization of neutral atomic oxygen. Strong emission at 538-539 A is most likely due to the quartet rather than the doublet transitions, which both occur at these wavelengths and which are not spectrally resolved in the data. The intensities of the weaker lines are consistent with recent laboratory measurements of transition branching ratios. Several strong O II lines near He I 584 produce severe contamination of low-altitude (less than 400 km) measurements of geocoronal helium emission made with thin-film broadband photometers.
Anderson Donald E. Jr.
Feldman Paul D.
Gentieu E. P.
Meier Robert R.
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