Mathematics – Probability
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3402307r&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 2, CiteID L02307
Mathematics
Probability
18
Geomagnetism And Paleomagnetism: Dynamo: Theories And Simulations, Geomagnetism And Paleomagnetism: Reversals: Process, Timescale, Magnetostratigraphy, Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Nonlinear Geophysics: Probability Distributions, Heavy And Fat-Tailed (3265), Nonlinear Geophysics: Turbulence (3379, 4568, 7863)
Scientific paper
We consider geomagnetic field reversal sequences from the last 160 Ma, and find the inter-reversal times to be well fit by a lognormal distribution. Such a distribution could arise from `multiplicative noise' in the underlying geodynamo; and turbulent fluctuations within the core may be expected to provide such noise via the α-effect of dynamo theory. We investigate this mechanism by coupling a low order αω-type dynamo to a shell model of turbulence. This model reproduces field reversals varying in duration from subchrons to superchrons; these are reasonably fit by a lognormal distribution, consistent with the multiplicative noise mechanism proposed.
Ryan David A.
Sarson Graeme R.
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