Periodicity of the earth's magnetic reversals

Details Periodicity of the earth's magnetic reversals Periodicity of the earth's magnetic reversals

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..444s&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, July 31, 1986, p. 444-446.

Computer Science

24

Geomagnetism, Magnetic Field Inversions, Polarity, Secular Variations, Time Series Analysis, Harmonics, Paleomagnetism

Scientific paper

Results are presented from an attempt to perform a relatively comprehensive analysis of the evidence for a periodicity, with harmonics, of the observed regular reversals of the earth's magnetic field. The database considered covers 296 reversals over the past 165 Myr. Histograms with bins 1 Myr apart reveal only 30 Myr reversal patterns. The reversal dates are fitted to a linear periodic function and a spectrum is computed for the residuals at the adopted dates. The possible presence of multiple periodicities is evaluated and over various time intervals. The analysis shows that a recently observed 15 Myr periodicity is probably a harmonic of the 29.5-30.5 Myr period. The calculations do not confirm an inherent magnetic reversal property of the earth. The reversals may arise from tectonic events or from impacts from extraterrestrial objects.

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