On the outer layers of the core and geomagnetic secular variation

Details On the outer layers of the core and geomagnetic secular variation On the outer layers of the core and geomagnetic secular variation

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.4103l&link_type=abstract

Journal of Geophysical Research, vol. 87, May 10, 1982, p. 4103-4108.

Physics

21

Earth Core, Earth Rotation, Geomagnetism, Magnetic Variations, Secular Variations, Convection, Coupling, Earth Mantle, Electrical Resistivity, Electromagnetic Interactions, Lorentz Force, Magnetic Dipoles, Radial Velocity, Thickness, Torque

Scientific paper

Observations of the thickness and convective regime of the outer core layers within the earth are examined to find connections to the geomagnetic secular variation. Correlations are displayed between the earth's angular rotation and the first derivative of declination of the geomagnetic field, showing decade variations on the order of magnitude of 3 x 10 to the minus 12th rad/sec and 10 arcmin/yr, respectively. The earth is regarded as having three layers: an inner core, outer core, and mantle. Each layer rotates with different angular velocities which are also different than the mean body rotation of the whole earth. A dipolar magnetic field is assumed generated by the inner core, and torques are calculated for each layer, resulting from Lorentz forces arising from an interaction between the electric currents sustaining the toroidal fields and the poloidal main field. The mantle conductivity is estimated, and is found to determine the phase lag between rotation and geomagnetic variations.

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