AUTOCORRELATION STUDY ON TEMPERATURE-CHANGES IN THE TROPICAL STRATOSPHERE

Auto-correlation analyses on temperature changes in the tropical strat osphere over the meteorological rocket launching station, Thumba (8-de grees-N, 77-degrees-E), for the period 1970-1990 have been carried out . In the tropical stratosphere, at around 28-30 and 48-50 km levels th ere exists a passive region of least association between adjacent leve ls. Considerable dynamical changes are noticed at around 33-42 km alti tude zone. Annual and semi-annual oscillations are dominant at around 37-38 km zone. In the upper stratosphere, annual oscillation is found to be more dominant than the semiannual oscillation.