Thirty year variations in the Earth rotation and the geomagnetic Gauss coefficients

Details Thirty year variations in the Earth rotation and the geomagnetic Gauss coefficients Thirty year variations in the Earth rotation and the geomagnetic Gauss coefficients

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2957y&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 24, p. 2957-2960

Physics

4

Chandler Wobble, Earth Rotation, Geomagnetism, Spherical Harmonics, Magnetic Dipoles, Ocean Currents, Phase Shift, Time Series Analysis

Scientific paper

Decade variations in the three components of the Earth rotation and low-degree geomagnetic Gauss coefficients are examined. Variations with a time scale of 20-30 years are confirmed in both the Earth rotation and the magnetic axial dipole moment. The second degree tesseral Gauss coefficients also appear to have a variation with the same time scale. The components are characterized by high ellipticity of the g-h path in the direction of 34 deg W. They appear to have phase change at around 1940. Considering the phase change, paths of the components and the mean pole have great similarity.

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