| Summary: | Daily behaviours of the quasi-stationary part and travelling one of the ultra-long waves areanalyzed at 300 mb in the latitudinal zone from 300 N to 850 N for period of February-March 1968, in which a significant blocking action occurs in the North Atlantic. Remarkable amplificationof the quasi-stationary waves of wavenumbers 1 and 4, the phases of which agree approximatelywith the location of the blocking high, is noticed during the period of the blocking action. Cor-responding to this amplification, the amplitudes of travelling waves of wavenumbers 1 and 3 and ofthe quasi-stationary waves of wavenuinbers 2 and 3 decrease. This fact suggests that exchange ofthe energy may take place between travelling wave and quasi-stationary one of each wavenumber. Daily behaviours of the quasi-stationary part and travelling one of the ultra-long waves areanalyzed at 300 mb in the latitudinal zone from 300 N to 850 N for period of February-March 1968,in which a significant blocking action occurs in the North Atlantic. Remarkable amplificationof the quasi-stationary waves of wavenumbers 1 and 4, the phases of which agree approximatelywith the location of the blocking high, is noticed during the period of the blocking action. Cor-responding to this amplification, the amplitudes of travelling waves of wavenumbers 1 and 3 and ofthe quasi-stationary waves of wavenuinbers 2 and 3 decrease. This fact suggests that exchange ofthe energy may take place between travelling wave and quasi-stationary one of each wavenumber.
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