Coexisting stochastic and coherence resonance in a mean-field dynamo model for Earth's magnetic field reversals
arXiv:0709.3932 · doi:10.1140/epjb/e2008-00353-0
Abstract
Using a spherical symmetric mean field alpha^2-dynamo model for Earth's magnetic field reversals, we show the coexistence of the noise-induced phenomena coherence resonance and stochastic resonance. Stochastic resonance has been recently invoked to explain the 100 kyr periodicity in the distribution of the residence time between reversals. The comparison of the resulting residence time distribution with the paleomagnetic one allows for some estimate of the effective diffusion time of the Earth's core which may be 100 kyr or slightly below rather than 200 kyr as it would result from the molecular resistivity.
6 pages, 9 figures
References in corpus (11)
- Surrogate time series
- Practical implementation of nonlinear time series methods: The TISEAN package
- On the magnetic fields generated by experimental dynamos
- Asymmetric polarity reversals, bimodal field distribution, and coherence resonance in a spherically symmetric mean-field dynamo model
- Oscillatory mean-field dynamos with spherically symmetric, isotropic alpha
- The clustering of polarity reversals of the geomagnetic field
- Why dynamos are prone to reversals
- Geodynamo alpha-effect derived from box simulations of rotating magnetoconvection
- Oscillating α^2-dynamos and the reversal phenomenon of the global geodynamo
- Reversals in nature and the nature of reversals
- Resemblances and differences in mechanisms of noise-induced resonance