A note on the sub-tropical jet stream in the Australian region

Using data previously obtained by Muffatti (1963) and Weinert (1968) for the years 1956 to 1961 and new data covering the period 1962 to 1968 auto-correlation functions of wind speed along the axis of the sub-tropical jet stream at 200 m b in the Australian region have been estimated. From these functions seasonal values of a longitudinal length scale have been evaluated. It is found that the form of the auto - correlation function shows similarity between seasons and that there is a systematic variation in length scale with maximum values in autumn and spring and minimum values in summer and winter.