Studies of variations in the length of the day (I.o. d.) on the order of a few milliseconds over the period of a few decades are briefly reviewed. In this connection, studies of the dynamo theory of geomagnetism, the westward drift of the magnetic field, and electromagnetic core-mantle coupling preface the theory of the decade fluctuations in the 1. o.d. Keywords: core-mantle coupling, decade fluctuations, dynamo theory, earth's core, geomagnetism, rotation of the earth, westward drift. 1.
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