Coupled motions of the inner core and possible geomagnetic implications

Details Coupled motions of the inner core and possible geomagnetic implications Coupled motions of the inner core and possible geomagnetic implications

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...36...27s&link_type=abstract

(International Association of Geomagnetism and Aeronomy, Symposium on Origin of Main Fields and Secular Changes of the Earth and

Physics

16

Dynamo Theory, Earth Core, Geomagnetism, Electromagnetic Coupling, Gravitational Effects, Integral Equations, Long Term Effects, Precession, Torque

Scientific paper

As the inner core is a good electrical conductor any ambient magnetic field would diffuse into it on a time scale long compared to several thousand years, and conversely be frozen there on shorter time scales. From the observations that the dipole component of the earth's magnetic field has been inclined persistently to the spin axis over hundreds of thousands of years, and that the dipole drifts and decays significantly more slowly than the nondipole field, it is suggested that the external dipole is simply a manifestation of a field frozen in an inclined inner core. It is shown that the much neglected gravitational restoring torque can be significant for an inclined inner core, so much so that its motion is in the main determined by gravity, with electromagnetic and inertial coupling effects being of secondary importance. A regular precession of the inner core is shown to be possible where its spin axis drifts westward relative to the mantle with a period of about 7000 y. Some preliminary calculations of the possible motions of a gravitationally coupled mantle-inner core system are shown.

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