TY  - JOUR
A1  - Höpfner, Joachim
T1  - Low frequency variations, Chandler and annual wobbles of polar motion asobserved over one century
Y1  - 2003
JF  - Scientific Technical Report / Geoforschungszentrum Potsdam
DO  - 10.23689/fidgeo-610
PB  - GFZ
CY  - Helmholtz-Zentrum
N2  - Polar motion data is available from the mid-19th century to the present. Based on time series with a variety of sampling intervals (monthly, 0.05-year, 5-day and daily), we have separated the low-frequency terms by low-pass filtering and the Chandler and annual terms by recursive band-pass filtering of the pole coordinates. Using a simple unweighted least-squares fit to the filtered low-frequency terms, the linear trends of the rotation pole were estimated. Assessing the estimates based on intercomparisons, the most reliable trend estimate was found. Using a Fast Fourier Transform, we have computed the prograde, retrograde and total amplitude spectra of the low-frequency part of polar motion in order to reveal the long-periodic signals. The characteristics and time evolution of the Chandler and annual wobbles are described by changes in their parameters (radii, directions and period lengths) over one century.
UR  - http://hdl.handle.net/11858/00-1735-0000-0001-32F3-3
ER  -