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Abstract
The oscillation of longitudinal position of the very long atmospheric waves, of wave-number 1, 2, and 3 has been described by KUBOTA and IIDA (1954), ELIASEN (1958), and others. In this note the motions of these waves are further examined, the data being Fourier zonal harmonics of the 500 mb height at latitudes 40", 50 ", and 60" N for the period October 1, 1951, to March 31, 1952. In the following, the phase-angle represents displacement west of Greenwich, so that it decreases for a progressive, easterly moving wave.