Abstract
Long-period variations of winds observed by the radio reflection technique at Saskatoon, from 65 to 110km, 1969-1975, show some significant differences from the CIRA 1972 model. The maximum amplitude of the annual wave below 80km is found to be only 22ms-1, while CIRA shows 45ms-1 at this latitude. The semiannual wave below 75km at Saskatoon has an amplitude only half that of CIRA. Its phase shows a consistant downward propagation from 118 to 70km at 8km month-1. No appreciable terannual wave was found at Saskatoon, but a weak 3-month wave shows the same phase progression pattern as for the semiannual. A QBO is found at Saskatoon with amplitude of 10ms-1 above 100km.
