Sawtooth paleointensity and reversals of the geomagnetic field

Details Sawtooth paleointensity and reversals of the geomagnetic field Sawtooth paleointensity and reversals of the geomagnetic field

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..103..247m&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 103, p. 247-252.

Physics

8

Scientific paper

Valet and Meynadier (Valet, J.P., Meynadier, L., 1993) noted an intriguing sawtooth intensity pattern in sequences drilled during Leg 138 of the Ocean Drilling Program. The pattern is an almost linear decrease in intensity during stable polarity times followed by a rapid recovery or increase in intensity immediately after a reversal. They further noted an apparent correlation between the size of the intensity of the recovery and the length of the subsequent polarity chron and inferred that reversals are a consequence of a progressive degradation of the dipole field in that a strong dipole field inhibits a future reversal. This has significant potential implications for dynamo theory. However, their hypothesis implies that the nonstationarity in reversal rate during the Cenozoic is controlled by inhibition, and so their hypothesis is immediately testable using the available reversal chronology. Analysis of the chronology shows that the hypothesis is not sustainable.

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