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| Titel |
The observation of chemiluminescent NiO* emissions in the laboratory and in the night airglow |
| VerfasserIn |
W. F. J. Evans, R. L. Gattinger, A. L. Broadfoot, E. J. Llewellyn |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 18 ; Nr. 11, no. 18 (2011-09-16), S.9595-9603 |
| Datensatznummer |
250010081
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| Publikation (Nr.) |
 copernicus.org/acp-11-9595-2011.pdf |
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| Zusammenfassung |
| The recent finding of an orange spectral feature in OSIRIS/Odin spectra of
the night airglow near 87 km has raised interest in the origin of the
emission. The feature was positively identified as the chemiluminescent
FeO* emission where the iron is of meteoric origin. Since the
meteorite source of atomic metals in the mesosphere contains both iron and
nickel, with Ni being typically 6 % of Fe, it is
expected that faint emissions involving Ni should also be present in the
night airglow. The present study summarizes the laboratory observations of
chemiluminescent NiO* emissions and includes a search for the
NiO* signature in the night airglow. A very faint previously
unidentified "continuum" extending longwave of 440 nm has been detected in
the night airglow spectra obtained with two space-borne limb viewing
instruments. Through a comparison with laboratory spectra this continuum is
identified as arising from the NiO* emission. The altitude profile
of the new airglow emission has also been measured. The similarity of the
altitude profiles of the FeO* and NiO* emissions also
suggests the emission is NiO as both can originate from reaction of the
metal atoms with mesospheric ozone. The observed NiO* to FeO* ratio exhibits considerable variability; possible causes of this observed
variation are briefly discussed. |
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