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| Titel |
MLT gravity wave climatology in the South America equatorial region observed by airglow imager |
| VerfasserIn |
A. F. Medeiros, H. Takahashi, R. A. Buriti, J. Fechine, C. M. Wrasse, D. Gobbi |
| 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 ; 25, no. 2 ; Nr. 25, no. 2 (2007-03-08), S.399-406 |
| Datensatznummer |
250015786
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| Publikation (Nr.) |
 copernicus.org/angeo-25-399-2007.pdf |
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| Zusammenfassung |
| An all-sky CCD imager for OH, O2 and OI (557.7 nm) airglow emission
measurements was operated at São João do Cariri (Cariri), Brazil
(7° S, 36° W), from October 2000 to December 2004. A large amount of
image data, more than 3000 h of observation and around 1000 wave events,
makes it possible to classify the gravity wave characteristics, which are
statistically significant. The observed waves show a typically short
horizontal wavelength (5–45 km) and a short period (5–35 min), and
horizontal phase speeds of 1 to 80 m/s. In most cases band-type waves
(horizontal wavelength between 10 and 60 km) showed a clear preference for
the horizontal propagation direction from the South American continent to
the Atlantic Ocean. Ripples also have similar features but with different
anisotropy. In this paper we focus our discussion on the wave
characteristics of the bands and ripples and a comparison between them. |
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