The O(<sup>1</sup>S) dayglow emission as observed by the WIND imaging interferometer on the UARS
Item
Title (Dublin Core)
The O(<sup>1</sup>S) dayglow emission as observed by the WIND imaging interferometer on the UARS
Description (Dublin Core)
Volume emission rate profiles of the O(<sup>1</sup>D-<sup>1</sup>S)
5577 Å dayglow measured by the WIND imaging interferometer on the Upper
Atmosphere Research Satellite are analyzed to examine the O(<sup>1</sup>S)
excitation mechanisms in the sunlit lower thermosphere and upper mesosphere. The
observed emission profiles are compared with theoretical profiles calculated
using a model which takes into account all of the known daytime sources of O(<sup>1</sup>S).
These include photoelectron impact on atomic oxygen, dissociative recombination
of O<sup>+</sup><sub>2</sub>, photodissociation of molecular oxygen, energy
transfer from metastable N<sub>2</sub>(<i>A</i><sup>3</sup>Σ<sup>+</sup><i><sub>u</sub></i>)
and three body recombination of atomic oxygen. Throughout most of the
thermosphere the measured and modelled emission rates are in reasonably good
agreement, given the limitations of the model, but in the region below 100 km,
where the oxygen atom recombination source is likely to dominate, the measured
emission rates are considerably larger than those modelled using the MSIS-90
oxygen atom densities. This discrepancy is discussed in terms of possible
inadequacies in the MSIS-90 model atmosphere and/or additional sources of O(<sup>1</sup>S)
at low altitude.
5577 Å dayglow measured by the WIND imaging interferometer on the Upper
Atmosphere Research Satellite are analyzed to examine the O(<sup>1</sup>S)
excitation mechanisms in the sunlit lower thermosphere and upper mesosphere. The
observed emission profiles are compared with theoretical profiles calculated
using a model which takes into account all of the known daytime sources of O(<sup>1</sup>S).
These include photoelectron impact on atomic oxygen, dissociative recombination
of O<sup>+</sup><sub>2</sub>, photodissociation of molecular oxygen, energy
transfer from metastable N<sub>2</sub>(<i>A</i><sup>3</sup>Σ<sup>+</sup><i><sub>u</sub></i>)
and three body recombination of atomic oxygen. Throughout most of the
thermosphere the measured and modelled emission rates are in reasonably good
agreement, given the limitations of the model, but in the region below 100 km,
where the oxygen atom recombination source is likely to dominate, the measured
emission rates are considerably larger than those modelled using the MSIS-90
oxygen atom densities. This discrepancy is discussed in terms of possible
inadequacies in the MSIS-90 model atmosphere and/or additional sources of O(<sup>1</sup>S)
at low altitude.
Creator (Dublin Core)
V. Singh
I. C. McDade
G. G. Shepherd
B. H. Solheim
W. E. Ward
Subject (Dublin Core)
Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
Publisher (Dublin Core)
Copernicus Publications
Date (Dublin Core)
1996-06-01T00:00:00Z
Type (Dublin Core)
article
Identifier (Dublin Core)
10.1007/s00585-996-0637-y
0992-7689
1432-0576
https://doaj.org/article/50d63e1365014b23813524b9e01e9976
Source (Dublin Core)
Annales Geophysicae, Vol 14, Pp 637-646 (1996)
Language (Dublin Core)
EN
Relation (Dublin Core)
https://www.ann-geophys.net/14/637/1996/angeo-14-637-1996.pdf
https://doaj.org/toc/0992-7689
https://doaj.org/toc/1432-0576
Provenance (Dublin Core)
Journal Licence: CC BY