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We report OI557.7 nm night airglow observations with the help of a charged-couple device (CCD)-basedall-sky camera from a low-latitude station, Gadanki (13.5° N;79.2° E). Based on the data collected during March and April over 3years, from 2012 to 2014 (except March 2013), we characterize the small-scalegravity wave properties. During this period, 50 gravity wave eventswere detected. The horizontal wavelengths of the gravity waves are found toranging from 12  to 42 km with the phase velocity 20–90 m s<sup>−1</sup>. In mostcases, these waves were propagating northward with only a fewoccurrences of southward propagation. In the present novel investigationfrom the Indian sector, each of the wave events was reverse-ray-traced toits source. The outgoing longwave radiation (OLR) suggested thattropospheric convection was a possible source for generation of the observedwaves. It was found that approximately 66 % of the events were triggereddirectly by the convection

Mesospheric gravity wave characteristics and identification of their sources around spring equinox over Indian low latitudes