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| Titel |
Daytime sodium airglow emission measurements over Trivandrum using a scanning monochromator: first results |
| VerfasserIn |
M. M. Hossain, T. K. Pant, C. Vineeth, S. G. Sumod, R. Sridharan |
| 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 ; 28, no. 11 ; Nr. 28, no. 11 (2010-11-09), S.2071-2077 |
| Datensatznummer |
250016911
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| Publikation (Nr.) |
 copernicus.org/angeo-28-2071-2010.pdf |
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| Zusammenfassung |
| This paper presents measurement of daytime Sodium (Na) airglow emissions at
589.6 nm wavelength using a ground based 1-m scanning monochromator from
Trivandrum (8.5° N, 77° E, 0.5° N dip latitude), a
near-equatorial station in India. The Na emission intensity exhibits
significant temporal variability within a day and from one day to another.
The Na intensity has been compared with the daytime OH airglow intensity at
731.6 nm simultaneously measured using the unique Multiwavelength
Dayglow Photometer (MWDPM). The temporal variabilities of the Na and OH
intensities corroborate each other in most of the occasions without any
appreciable time delay, although a small time delay up to ~10 min
has been observed at times. It appears that the variability of daytime Na
emissions is influenced too by the photo-chemical excitations. The observed
similarities in the Na and OH intensities are believed to be due to the
similar roles played by [O] and O3 (in their photo-chemical
excitations) and the dynamics occurring at about the same altitude region
(~90 km). It has also been found that the gravity waves play
significant role in producing the short-scale oscillations in these
emissions. |
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