15-Myr periodicity in the frequency of geomagnetic reversals since 100 Myr

Details 15-Myr periodicity in the frequency of geomagnetic reversals since 100 Myr 15-Myr periodicity in the frequency of geomagnetic reversals since 100 Myr

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..328m&link_type=abstract

Nature (ISSN 0028-0836), vol. 304, July 28, 1983, p. 328-330.

Physics

35

Geomagnetism, Magnetic Field Inversions, Paleomagnetism, Autocorrelation, Temporal Distribution

Scientific paper

Statistical studies of the frequency of geomagnetic reversals during the last 100 Myr are reported. The time scales of Lowrie and Alvarez (1981) and of Labreque et al. (1977) were examined using moving rectangular windows with widths of from 2 to 8 Myr, and plots of the reversal frequency versus time were analyzed in terms of a rising monotonic (Lorentzian) and an oscillating component. The latter is determined by subtracting the monotonic component from the reversal-frequency curve and performing a time autocorrelation on the remainder. A direct least-squares fit of a 31-Myr-halfwidth Lorentzian and a 15.1-Myr-period sine function to the Labreque-time-scale data is shown. The possible physical implications of these statistical findings are discussed.

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