Computer Science
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..763l&link_type=abstract
Nature, vol. 290, Apr. 30, 1981, p. 763-765.
Computer Science
45
Atmospheric Circulation, Earth Planetary Structure, Earth Rotation, Geomagnetism, Magnetic Variations, Periodic Variations, Earth Core, Earth Mantle, Earth Motion, Magnetic Field Configurations, Magnetohydrodynamic Waves
Scientific paper
Consideration is given to the possible correlation between earth rotation and geomagnetic westward drift as a means of explaining the decade variations observed in earth rotation. Secular variations of the east component of the magnetic field, which can be used as an indicator of the magnitude of the westward drift of the upper core, are compared with variations in day length for the period from 1861 through 1978. Data reveal a good correlation between the magnetic declination and the excess day length, with the magnetic variations leading the day length variations by about 10 years. Interpretation of the data in terms of a model of a convecting core which causes differential rotation between the outer and inner regions results in a value of 100 km for the thickness of the upper core zone, with the time lag of the changes in day length relative to westward magnetic drift a measure of the coupling between the mantle and the inner core. Data for the period 1700-1870 also support the correlation, although the dramatic changes observed since 1870 are not evident.
Courtillot Vincent
Ducruix Joël
Le Mouël Jean Louis
Madden Theodore R.
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