Abstract
A time-height section of the guasi-biennial oscillation is presented from 1950 to 1978 and the presence of an unusually large westerly amplitude during the winter 1977–78 is noted. Abstract A time-height section of the guasi-biennial oscillation is presented from 1950 to 1978 and the presence of an unusually large westerly amplitude during the winter 1977–78 is noted.