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The characteristics of the quasi-2-day wave (QTDW) in the lower atmosphere(1–50 km) has been investigated using wind and temperature data obtainedfrom India Meteorological Department (IMD), Hyderabad (17.4° N,78.5° E) and ECMWF Re-Analysis (ERA-interim) data for (18° N,78° E) which is the nearest grid to the location of observation. Windand temperature data of IMD between 15 May and 24 September 2009 in thealtitude range of 1–25 km have been used for the present study.Simultaneous ERA data of wind and temperature for the same period betweenthe pressure levels of 1–1000 mb have been analyzed for 2-day waveactivity. Appreciable amplitudes of the wave (~2–3 m s<sup>−1</sup>) couldbe observed in both IMD and ERA datasets of winds. The thermal amplitudemaximum is ~1.5 K in the lower stratosphere (IMD). Amplitudes obtainedfrom ERA data are found to be less than those obtained from IMDmeasurements. Maximum wind amplitudes (1.5–2 m s<sup>−1</sup>) are observed in theUTLS region and in the upper stratosphere between 35–45 km. Peak value oftemperature oscillation in the upper stratosphere is ~1 K. Waveletanalyses show systematic bursts of QTDW during the summer solstice with agap of ~5–8 days. The striking similarity between the results of IMDand ERA data can be appreciated. The squared-coherence values between thetwo datasets in terms of cross-spectral amplitudes are found to be highlysignificant for 2-day wave in the lower atmosphere

Quasi-two-day wave in the lower atmosphere over Hyderabad during summer of 2009