Observations of gravity waves from multispectral mesospheric nightglow emissions observed at 23 deg S

Details Observations of gravity waves from multispectral mesospheric nightglow emissions observed at 23 deg S Observations of gravity waves from multispectral mesospheric nightglow emissions observed at 23 deg S

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..395f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 4, p. 395-405

Physics

6

Emission Spectra, Gravity Waves, Mesosphere, Nightglow, Nocturnal Variations, Tropical Regions, Amplitudes, Brazil, Cross Correlation, Oxygen Spectra, Ozone, Photometers, Wavelengths

Scientific paper

Simultaneous measurements of the OI 557.7 nm, O2 atmospheric (0,1) band, NaD and OH (9,4) band emissions obtained during the period October-November 1989 at Cachoeira Paulista (23 deg S, 45 deg W), Brazil, have been analyzed to study gravity waves in the mesospheric region at a low-latitude station in the southern hemisphere. It was found that, when these emission showed large temporal intensity variations, there were also short period quasi-coherent temporal variations superposed on them, suggesting a possible passage of internal gravity waves in the emission layers. Cross-correlation analysis indicates that the time lag between the different emissions is smaller for short period variations compared with the long period variations. The wave parameters, namely a vertical wavelength of 12 km, a horizonatal derived wavelength of 200 km with a period of 80 min, estimated from one of the observed short-period coherent oscillations, are typical of the internal gravity waves at the airglow emission height.

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