On the 60-year signal from the core

Details On the 60-year signal from the core On the 60-year signal from the core

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gapfd.101...11r&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 100, Issue 1, p.11-35

Physics

Fluid Dynamics

16

Length Of Day (Lod), Geomagnetic Secular Variation, Torsional Oscillations

Scientific paper

The decadal variation in the length of day and in the Earth's magnetic field is analyzed by empirical mode decomposition (EMD). The existence of a periodicity of about 60-years in the Earth's angular velocity has often been inferred and is confirmed here, with a new estimate of approximately 62 years. The existence of a similar periodicity in the geomagnetic field has been controversial. From the time series analyses presented here of the magnetic declination at 10 observatories, it is concluded that a geomagnetic periodicity of about 62 ± 3 years does exist. A similar analysis of the magnetic inclination at five observatories gives a period of 58 ± 5 years. The declination data from four observatories is found to correlate with the length of day signal, with a correlation coefficient of approximately 0.6.

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