First airglow all sky images at 23° S Original Research Article

An all sky imaging system using a cooled CCD camera with 4 interference filters mounted has been constructed and was installed at Cachoeira Paulista airglow observatory (22.7°S, 45.0° W) in February 1996. The airglow OI 557.7 nm, 630.0 nm, hydroxyl Meinel bands in the near infrared region (<930 nm) and background continuum at 578 nm emission were measured successfully. Wavelike structures in the OH emission were observed. Occasionally airglow depletions in the ionospheric plasma bubbles were also observed for both the OI 630.0 nm and OI 557.7 nm.