The Earth's inner core: its discovery and other surprises.

Details The Earth's inner core: its discovery and other surprises. The Earth's inner core: its discovery and other surprises.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26g....38...15g&link_type=abstract

Astronomy and Geophysics, Vol. 38, Issue 4, p. 15 - 18

Physics

Geophysics

Earth Core

Scientific paper

The Earth has the extraordinary internal structure of a liquid core with a solid centre. This structure was established early this century by studies of seismic waves generated by earthquakes that traverse the whole Earth. Recently, seismology has also established that the solid inner core is rotating at about a degree per year faster than the rest of the planet. This rotation could be a steady response to the force induced by the geomagnetic field; alternatively it may be part of a longer-term oscillation. The inner core is like an inner moon, suspended at the very centre of the Earth by gravity, free to spin, librate, or oscillate about its equilibrium position established by gravity. It plays a crucial role in the generation of the magnetic field, providing a substantial part of the power supply to the dynamo and stabilizing the dynamics of the fluid outer core. Without it, the geomagnetic field would behave very differently, or perhaps would not exist at all.

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