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We present the characteristics of small-scale (<100 km) gravity waves inthe equatorial mesopause region derived from OH airglow imaging observationsat Kototabang (100.3° E, 0.2° S), Indonesia, from 2002 to 2005.We adopted a method that could automatically detect gravity waves in theairglow images using two-dimensional cross power spectra of gravity waves.The propagation directions of the waves were likely controlled by zonalfiltering due to stratospheric mean winds that show a quasi-biennialoscillation (QBO) and the presence of many wave sources in the troposphere

Characteristics of equatorial gravity waves derived from mesospheric airglow imaging observations