The height and temperature fields at the mandatory levels during a two-month period (December 1977-January 1978 are used to evaluate the conversion between available potential energy (A) and kinetic energy (K), C(A, K). The results reveal: 1. The energy conversion due to the mean meridional circulation, C(Az, Kz)=-0.18Wm-2, and due to the eddy motions, C(AE, KE)=2.6Wm-2. 2. C(Az, KZ) is attributed to the standing (2-month mean) mode, while C(AE, KE) is due to the transient eddies. 3. The

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... utions to C(AE, KE) from various wave number regimes, long waves (n=1-4), and cyclone and short waves (n=5-15), are: a. Transient cyclone and short waves are dominant in the mid-latitudes and the middle layer of atmosphere. b. Transient long waves are significant in the middle layer of the atmosphere at midand high latitudes. c. Standing long waves are not negligible in the mid-latitudes and the middle layer of atmosphere.