%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%@archivingpolicy denypublisher denyfinaldraft24
%@issn 1364-6826
%@resumeid
%@resumeid
%@resumeid
%@resumeid 8JMKD3MGP5W/3C9JHCM
%@resumeid 8JMKD3MGP5W/3C9JJ3H
%@resumeid 8JMKD3MGP5W/3C9JGTE
%@usergroup administrator
%@usergroup alexandra
%@usergroup marciana
%3 comparison of gravity.pdf
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX.
%@secondarykey INPE-11013-PRE/6469
%@ 1364-6826
%A Medeiros, Amauri Fragoso de,
%A Buriti, R A,
%A Machado, E A,
%A Takahashi, Hisao,
%A Batista, Paulo Prado,
%A Gobbi, Delano,
%A Taylor, M J,
%T Comparison of gravity wave activity observed by airglow imaging at two different latitudes in Brazil
%B Journal of Atmospheric and Solar-Terrestrial Physics
%D 2004
%V 66
%N 6-9
%P 647-654
%8 Apr-Jun.
%2 sid.inpe.br/jeferson/2004/07.27.15.57.24
%4 sid.inpe.br/jeferson/2004/07.27.15.57
%K Gravity wave, airglow, imager, winds.
%X An all-sky CCD imager for the OH,  O2 and OI (557.7 nm) 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 São João 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 wavelenghts of  5-60 km, periods of 5-35 min and horizontal phase velocities of 1-80  m/s. Band-type waves (horizontal wavelenghts between 10 and 85 km) showed a clear seasonal dependeney 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 wavelenghts of 5-65 km, with periods of 5-55 min and horizontal phase velocities of 5-105 m/s, much higher than CP. Band-type waves also exhibited a seasonal dependency in the horizontal propagation direction, propagation 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.
%@language English
%@copyholder SID/SCD
%@secondarytype PRE PI
%@area CEA
%@group DAE-INPE-MCT-BR
%@affiliation Universidade Federal de Campina Grande, Departamento de Física,
%@affiliation INPE
%@affiliation Space Dynamics Laboratory and Physics Department, Utah State University,