IMPORTANCE OF WIND FOR THE EXCITATION OF CHANDLER-WOBBLE AS INFERRED FROM WOBBLE DOMAIN ANALYSIS

We explored the atmospheric contribution to the excitation of Chandler wobble (CW), which has spanned about 11 years beginning from Septembe r 1983. The atmospheric angular momentum (AAM) function presented by t he Japan Meteorological Agency (JMA) and the wobble data set (SPACE93) are employed. We devised a wobble domain method of analysis which ena bles us to quantify the narrow band power of AAM. The AAM-induced wobb le closely resembles the observed wobble, and wind contribution turns out to dominate over atmospheric pressure contribution in the vicinity of the Chandler frequency. When only pressure contribution is taken i nto account, it is insufficient, as shown in previous studies.