Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985geoj...80..313n&link_type=abstract
Geophysical Journal (ISSN 0016-8009), vol. 80, Feb. 1985, p. 313-328.
Physics
5
Angular Acceleration, Earth Rotation, Lunar Eclipses, Secular Variations, Solar Eclipses, Earth Core, Earth Tides, Geomagnetism, Gravitational Constant, Lunar Effects
Scientific paper
The power spectrum of the earth's spin has important components with periods ranging from a few days to at least a few thousand years, and probably to the age of the earth. The secular acceleration refers to the components with periods longer than three centuries. In the year 600, the secular acceleration was -19.9 + or - 0.8 parts in a billion per century, while the value at the present time is less than half this size. The spin acceleration has important contributions from tidal friction and from an effect that is proportional to the square of the magnetic dipole moment. When these contributions are subtracted from the observed acceleration, contribution is left that amounts to +41 parts in a billion per century. This amount probably results from an unknown combination of changes in the size of the core, in the amount of glaciation, and in the size of the gravitational constant.
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