Abstract
Summary. This paper investigates whether the Chandler period is variable in time. The first step is to develop an Instantaneous Frequency Analysis to trace the time-varying spectrum for a non-stationary , complex-valued time series. The method is then applied to the observed polar motion to find no significant fluctuation of the Chandler period. Next, the observational grounds of the variable period hypothesis are re-examined. It is shown that the previous analytical technique does yield a fluctuating Chandler period even for simulation data of a constant frequency. We cannot find any positive evidence for the hypothesis.
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