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Altitude profiles of temperature in the stratosphere and lower mesosphere overGadanki (13.5° N, 79.2° E), based on lidar observations duringthe Equatorial Wave Study campaign (29 February–2 April 2000), showed ananomalous cooling of the stratosphere, lasting for about 4–5 days.Immediately following this stratospheric cooling, a prominent ~4-dayperiod oscillation is observed in the zonal, as well as meridional wind in the30–50 km altitude region, obtained from simultaneous rocketsonde and balloonwind measurements. The amplitude of this wave is in the range of 5–15 ms<sup>−1</sup> inthis altitude region. The altitude profiles of phase of this 4-dayoscillation show a constant phase with height indicating that the wave isnot propagating vertically. The causative mechanism for the sudden coolingis investigated by examining the day-to-day variation in the totalatmospheric column ozone. Zonal and meridional wind components of thisoscillation are approximately in quadrature phase, with zonal wind leadingthe meridional wind. Strikingly, while the 4-day wave is clearly observablein the zonal and meridional winds, it is almost absent in the temperature

annales geophysicae

Observational evidence for the generation of a 4-day oscillation in the low-latitude middle atmosphere associated with an anomalous stratospheric cooling