Computer Science – Sound
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1541m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, Dec. 1987, p. 1541-1552. NSERC-SERC-supported research.
Computer Science
Sound
28
Infrared Spectra, Nightglow, Oxygen Spectra, Rocket Sounding, Emission Spectra, Forbidden Transitions
Scientific paper
Coordinated rocket measurements of the O2 infrared atmospheric (0-0) band emission profile and the atomic oxygen densities in an undisturbed nighttime atmosphere are used to investigate the processes responsible for the excitation of O2(a1Delta g) in the terrestrial nightglow. It is shown that three-body recombination of atomic oxygen, and subsequent energy transfer processes, can explain only part of the observed emission profile and that at least two other sources of O2(a1Delta g) emission must exist. One of these additional sources, responsible for most of the emission observed below 90 km, is identified as arising from the nighttime residual of the very large dayglow 1Delta g population. The other additional source is required to explain most of the emission observed above 95 km. The processes responsible for this high altitude component cannot be identified but the vertical distribution of the required source function strongly resembles the profile of the atomic oxygen density squared and suggests that a two-body radiative recombination process may be involved. However, the measured zenith emission rates can also be explained without the high altitude source of O2(a1Delta g) if optical emission at 1.27 micron was induced by the rocket as it penetrated the nightglow layer.
Greer G. H. R.
Llewellyn Edam J.
McDade Ian C.
Murtagh Donal P.
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