Comparison of gravity wave activity observed by airglow imaging at two different latitudes in Brazil

Details Comparison of gravity wave activity observed by airglow imaging at two different latitudes in Brazil Comparison of gravity wave activity observed by airglow imaging at two different latitudes in Brazil

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..647m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 6-9, p. 647-654.

Physics

9

Gravity Wave, Airglow, Imager, Winds

Scientific paper

An all-sky CCD imager for the OH, O2and OI (557.7nm) airglow emissions was operated at Cachoeira Paulista (CP), Brazil (23°S,45°W), in collaboration with Utah State University, USA, during the period of 1998-2000. Another all-sky imager, which belongs to the Instituto Nacional de Pesquisas Espaciais, has been operating at Sa~o Joa~o do Cariri (Cariri), Brazil (7°S,36°W) since October 2000. Dominant gravity wave components were investigated by using the image data from the two sites. Wave characteristics observed at CP (October 1998-September 1999) show horizontal wavelengths of 5-60km, periods of 5-35min and horizontal phase velocities of 1-80m/s. Band-type waves (horizontal wavelengths between 10 and 85km) showed a clear seasonal dependency in the horizontal propagation direction, propagating to the southeast in summer and to the northwest in winter. The Cariri data (September 2000-August 2001) showed horizontal wavelengths of 5-65km, with periods of 5-55min and horizontal phase velocities of 5-105m/s, much higher than CP. Band-type waves also exhibited a seasonal dependency in the horizontal propagation direction, propagating to southeast in summer and northeast in winter. The results are interpreted in terms of wind filtering and a non-uniform distribution of the gravity wave sources.

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