Articles | Volume 36, issue 3
Ann. Geophys., 36, 899–914, 2018
https://doi.org/10.5194/angeo-36-899-2018

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 899–914, 2018
https://doi.org/10.5194/angeo-36-899-2018

Regular paper 21 Jun 2018

Regular paper | 21 Jun 2018

Seasonal characteristics of small- and medium-scale gravity waves in the mesosphere and lower thermosphere over the Brazilian equatorial region

Patrick Essien et al.

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Short summary
Present work reports seasonal characteristics of small- and medium-scale gravity waves in the mesosphere and lower thermosphere region. All-sky images of the hydroxyl airglow emission layer over São João do Cariri (7.4° S, 36.5° W) were observed from September 2000 to December 2010, during a total of 1496 nights and obtained 2343 SSGW and 537 MSGW events. The horizontal propagation directions of SSGWs and MSGWs showed clear seasonal variations based on the influence of the wind filtering process.