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Quasi-monochromatic gravity-wave-induced oscillations, monitored usingthe mesospheric OH airglow emission over Kolhapur (16.8° N,74.2° E), India, during January to April 2010 and January toDecember 2011, have been characterized using the Krassovsky method. Thenocturnal variability reveals prominent wave signatures with periods rangingfrom 5.2 to 10.8 h as the dominant nocturnal wave with embedded short-periodwaves having wave periods of 1.5–4.4 h. The results show that the magnitude ofthe Krassovsky parameter, viz. |<i>η</i>|, ranged from 2.1 to 10.2 h forprincipal or long nocturnal waves (5.2–10.8 h observed periods), and from1.5 to 5.4 h for the short waves (1.5–4.4 h observed periods) during theyears of 2010 and 2011, respectively. The phase (i.e., Φ) values of theKrassovsky parameters exhibited larger variability and varied from −8.1 to−167°. The deduced mean vertical wavelengths are found to beapproximately −60.2 ± 20 and −42.8 ± 35 km for long- andshort-period waves for the year 2010. Similarly, for 2011 the mean verticalwavelengths are found to be approximately −77.6 ± 30 and−59.2 ± 30 km for long and short wave periods, respectively,indicating that the observations over Kolhapur were dominated by upward-propagating waves. We use a full-wave model to simulate the response of OHemission to the wave motion and compare the results with observed values

Response of OH airglow emissions to mesospheric gravity waves and comparisons with full-wave model simulation at a low-latitude Indian station