Physics
Scientific paper
Dec 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969pepi....2..311n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 2, Issue 5, p. 311-317.
Physics
Scientific paper
Palaeomagnetic evidence shows that the geomagnetic field existed when the oldest crustal rocks were formed about 3 × 109 y ago. The geomagnetic intensity throughout geologic time since then has been fluctuating around the present value. These facts may indicate that the size and physical conditions of the Earth's core have been approximately the same during the past 3 × 109 y as they are at present. The geomagnetic field polarity has been repeatedly reversed. During the latest 107 y, the average time length of the geomagnetic polarity interval is about 0.21 × 106 y. If we assume that the asymmetrically distorted convection motion within the Earth's core becomes to have a symmetric pattern with time intervals of 0.105 × 106 y on average, the observed histogram of the geomagnetic polarity intervals can be explained. This is because the Bullard-Gellman dynamo based on a symmetric core convection motion is unstable whereas the Bullard-Gellman-Lilley dynamo based on an asymmetrically distorted convection becomes steady to result in a stationary dipole field of either northward or southward polarity.
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