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From: Mike Jr on 12 Feb 2010 09:45
"Most geophysicists agree that the main component of the Earth's field
– which defines the magnetic poles – is a dipole generated by the
convection of molten iron deep within the planet's interior.
Researchers can only use indirect methods, however, to infer the fine
details of the geodynamo, which may provide clues as to why the
Earth's magnetic poles have flipped every million years or so
throughout Earth history.

In search of these finer details, Akira Kageyama at Kobe University
and colleagues have modelled the geodynamo in search of a more
detailed picture of convection in the Earth's outer core. Their
simulation quickly established a secondary flow pattern, consisting of
inner sheet-like radial plumes, surrounded by westward cylindrical
zonal flow. "

http://physicsworld.com/cws/article/news/41686

--Mike Jr.
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