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The vertical structure of traveling planetary-scalc waves is investigated using spherical harmonics of the geo- potential field at levels from 1000 mb. to 10 mb., obtained from ESSA analyses. Fluctuations of thc large-scale har- monics are analyzed using vector regression methods. Westward-moving planetary-scale waves are shown to be present throughout the year at all the levels analyzed, with upward increasing amplitude in winter.

A STATISTICAL STUDY OF THE VERTICAL STRUCTURE OF TRAVELING PLANETARY-SCALE WAVES