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| Titel |
Lower thermospheric nitric oxide concentrations derived from WINDII observations of the green nightglow continuum at 553.1 nm |
| VerfasserIn |
C. H. A. Savigny, I. C. McDade, G. G. Shepherd, Y. Rochon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 11 ; Nr. 17, no. 11, S.1439-1446 |
| Datensatznummer |
250013836
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1439-1999.pdf |
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| Zusammenfassung |
Vertical profiles of nitric oxide in the
altitude range 90 to 105 km are derived from 553 nm nightglow continuum
measurements made with the Wind Imaging Interferometer (WINDII) on the Upper
Atmosphere Research Satellite (UARS). The profiles are derived under the
assumption that the continuum emission is due entirely to the NO+O air afterglow
reaction. Vertical profiles of the atomic oxygen density, which are required to
determine the nitric oxide concentrations, are derived from coordinated WINDII
measurements of the atomic oxygen OI 557.7 nm nightglow emission. Data coverage
for local solar times ranging from 20 h to 04 h, and latitudes ranging from 42°S
to 42°N, is achieved by zonally averaging and binning data obtained on 18
nights during a two-month period extending from mid-November 1992 until
mid-January 1993. The derived nitric oxide concentrations are significantly
smaller than those obtained from rocket measurements of the airglow continuum
but they do compare well with model expectations and nitric oxide densities
measured using the resonance fluorescence technique on the Solar Mesosphere
Explorer satellite. The near-global coverage of the WINDII observations and the
similarities to the nitric oxide global morphology established from other
satellite measurements strongly suggests that the NO+O reaction is the major
source of the continuum near 553 nm and that there is no compelling reason to
invoke additional sources of continuum emission in this immediate spectral
region.
Key words. Atmospheric composition and structure
(airglow and aurora; thermosphere – composition and chemistry; instruments and
techniques) |
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