Read e-book online Advances in Nonlinear Dynamos PDF

By Antonio Ferriz-Mas

ISBN-10: 041528788X

ISBN-13: 9780415287883

Nonlinear dynamo idea is important to figuring out the magnetic buildings of planets, stars and galaxies. In chapters contributed by way of a number of the top scientists within the box, this article explores many of the fresh advances within the box. either kinetic and dynamic techniques to the topic are thought of, together with speedy dynamos, topological tools in dynamo concept, physics of the sun cycle and the basics of suggest box dynamo. Advances in Nonlinear Dynamos is perfect for graduate scholars and researchers in theoretical astrophysics and utilized arithmetic, really these attracted to cosmic magnetism and comparable subject matters, reminiscent of turbulence, convection, and extra common nonlinear physics.

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Example text

The method may be regarded as an improvement to spectral theories in that it employs a natural function set to represent the field and the flow rather than the Fourier modes. The advantage is that the information on spatial structure of the field and flows remains intact. Convergence was an issue for the scheme of Bullard and Gellman (1954) because the existence of dynamo action was at stake, but is of less concern here. What matters is that the large scales are well represented. Note, finally, that Farrell and Ioannou (1999a, b) have argued that there are more efficient methods than eigenmode expansions, and their ideas may well be applicable in the present context.

Take a loop of magnetic field embedded in a highly conducting fluid and perform the sequence of operations shown in Fig. 1. In the first phase, the loop is stretched till it has twice its original length: assuming flux freezing, this doubles the field strength. Then twist the loop half a turn to get a figure-of-eight. Finally fold one half back on the other. The end result is a doubled loop with the same cross section as the original and twice the field strength. 1 Vainshtein and Zeldovich’s rope dynamo (see the text for details).

A complete ensemble may be set up by considering a set of copy systems each with the same mean parameters but with different realisation of the turbulence, cf. 1. To make things more visual, arrange these systems in a horizontal row next to one another. 8 The geodynamo as a bistable oscillator. The amplitude a of the dipole mode behaves as a . The central hill is due to heavily damped particle in a bistable potential supercritical dynamo action which forces the field away from zero, and the walls result from nonlinear α-quenching at large field amplitude.

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Advances in Nonlinear Dynamos by Antonio Ferriz-Mas

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