Journal of Conference Abstracts

High Scale Symmetry Breaking in a Two-side Cascade Geodynamo Model

Mikhail Shnirman (shnir@mitp.rssi.ru)¹, Elena Blanter (blanter@ium.ips.ras.ru)¹, Jean-louis Le Mouel² & Clement Narteau (narteau@ipgp.jussieu.fr)²

¹International Institute of Earthquake, Prediction Theory and Mathematical Geophysics, Varshavskoe sh.,79 korp 2, Moscow, 113556, Russia

²Institute de Physique du Globe de Paris, pl. Jussieu, 4, Tour 24, Paris, Cedex 05, 75252, France

A multiscale hierarchical model of geomagnetic field generation is suggested. The model describe the process of generation of the secondary magnetic field when the multiscale turbulent helical motion in a small-scale initial magnetic field exists. Both kind of cascade mechanism are involved: the direct and the inverse one. Investigations of the system behavior show, that the large-scale secondary magnetic field and strong symmetry breaks representing polarity reversal of the geomagnetic field may be obtained, when the two-side cascade exists. Symmetry breakings similar to the geomagnetic field reversals cannot be obtained in pure situations of direct or inverse cascades. The two-side cascade allow to obtain symmetry breakings with arbitrary long durations and quick reversals of polarity. The temporal evolution of the intensity of the artificial magnetic field is similar to the secular variation of the magnetic field of the Earth.