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5 papers · 1 filter
Cylindrical anisotropic dynamos
R. Avalos-Zuñiga, M. Xu, F. Stefani +2
We explore the influence of geometry variations on the structure and the time-dependence of the magnetic field that is induced by kinematic dynamos in a finite cylinder. Th…
Inferring basic parameters of the geodynamo from sequences of polarity reversals
Michael Fischer, Gunter Gerbeth, Andre Giesecke +1
The asymmetric time dependence and various statistical properties of polarity reversals of the Earth's magnetic field are utilized to infer some of the most essential parameters of…
Micro-crystalline inclusions analysis by PIXE and RBS
David Strivay, Claire Ramboz, J. P. Gallien +2
A characteristic feature of the nuclear microprobe using a 3 MeV proton beam is the long range of particles (around 70 μm in light matrices). The PIXE method, with EDS analysis and…
Reversals in nature and the nature of reversals
Frank Stefani, Mingtian Xu, Luca Sorriso-Valvo +2
The asymmetric shape of reversals of the Earth's magnetic field indicates a possible connection with relaxation oscillations as they were early discussed by van der Pol. A simple m…
Why dynamos are prone to reversals
Frank Stefani, Gunter Gerbeth, Uwe Guenther +1
In a recent paper (Phys. Rev. Lett. 94 (2005), 184506; physics/0411050) it was shown that a simple mean-field dynamo model with a spherically symmetric helical turbulence parameter…