On Wed Oct 18 2000 - 09:41:25 EDT,
Marcio Pie (pie@bu.edu) wrote:
>Hi there!
>
>Does anyone know when was the last inversion in the
>earth magnetic field?
The last significant one took place 780,000 years ago.
It is called the Matuyama/Brunhes Polarity Reversal.
Go see:
Jacobs, J. A. (1994) Reversals of the Magnetic Field.
Cambridge University Press.
Johnson, R. J. (1982) Brunhes-Matuyama magnetic reversal
dated at 790,000 yr BP by marine-astronomical correlations,
Quaternary Research. vol. 17, p. 135.
Spell, T. L., and McDougall, I. (1992) Revisions to the age of
the Brunhes-Matuyama boundary and the Pleistocene
geomagnetic polarity timescale, Geophysical Research Letters.
vol. 19, pp. 1181-1184.
Sun, D, Shaw, J., An, Z., and Rolph, T. (1993) Matuyama/Brunhes
(M/B) transition recorded in Chinese loess, Journal of
Geomagnetism and Geoelectricity. vol. 45, pp. 319-330.
Valet, J. P., and Meynadier, L. (1993) Geomagnetic field intensity
and reversals during the last four million years, Nature. vpl. 366,
pp. 234-238.
The Geodynamo
http://es.ucsc.edu/~glatz/geodynamo.html
http://es.ucsc.edu/~glatz/core.html
TITLE: A Study by Computer Simulation of the Generation and
Evolution of the Earth's Magnetic Field
http://ees5-www.lanl.gov/IGPP/EarthsMagneticField.html
Computer simulations reveal workings of the dynamo behind earth's magnetic
field
http://www.ucsc.edu/news_events/press_releases/archive/99-00/02-00/glatzmeier.htm
When North Goes South
http://www.psc.edu/MetaCenter/MetaScience/Articles/Glatzmaier/glatzmaier.html
Yours,
Keith Littleton
littlejo@vnet.net
New Orleans, LA
"At least in Russia you can get paperwork done
with bribes. I miss Russia."
Comment made by fellow geologist, who prefers to remain
anonymous, overheard at a New Orleans Geological Society
this Spring.
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