CSSAR airglow gravity wave imager and its preliminary observation

摘要

The CSSAR airglow imager is developed to investigate the atmospheric gravity waves near the mesopause region. The CSSAR imager consists of a fisheye with a focal length of 10.5 mm and an F number of 2.8, three pieces of lenses for collimation, two filters, an imaging lens and a scientific CCDcamera with 1024×1024 array, 24×24 micros pixels. Two filters for measuring the OH Meinel band(750-850nm) airglow layer peaking at 87 km and the O2 (865nm) airglow layer peaking at 90 km are used in the imager. Preliminary observation of the all-sky OH Meinel band airglow has been doneduring 02:00 to 06:00 on Jan. 5th, 2009, at Hancun (39.4°N, 116.6°E), Langfang, Hebei, which is thefirst time to image gravity wave in China. Case study shows that one quasi-monochromatic gravity wave has the horizontal wavelength of ～19 km, observed horizontal phase velocity of ～18 m/s,horizontal propagating azimuth direction of ～269° and observed period of ～18 min.