Observações de ondas de gravidade mesosféricas de baixas frequências via keograma da aeroluminescência OH IR

Continuos observation of airglow emissions obtained by an all-sky imager (INPE), installed at Cachoeira Paulista (230 S), have been used to investigate the characteristics on the major low frequencies oscillations. The images of the Near Infrared OH emissions produce keograms constructed from a north-south and east-west slice from the middle of every image joined over the whole night. The keograms are a convenient way to reveal wave activities over the whole night, on the other hand, the individual images are the best way to see short period gravity waves.