Nonlinear restrictions on dynamo action

Details Nonlinear restrictions on dynamo action Nonlinear restrictions on dynamo action

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..165v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 165-171. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

223

Astrophysics, Dynamo Theory, Magnetic Flux, Magnetohydrodynamic Turbulence, Plasma Diffusion, High Reynolds Number, Magnetic Diffusion, Milky Way Galaxy, Nonlinear Equations

Scientific paper

Astrophysical dynamos operate in the limit of small magnetic diffusivity. In order for magnetic reconnection to occur, very small magnetic structures must form so that diffusion becomes effective. The formation of small-scale fields is accompanied by the stretching of the field lines and therefore by an amplification of the magnetic field strength. The back reaction of the magnetic field on the motions leads to the eventual saturation of the dynamo process, thus posing a constraint on the amount of magnetic flux that can be generated by dynamo action, It is argued that in the limit of small diffusivity only a small amount of flux, many orders of magnitude less than the observed fluxes, can be created by dynamo processes.

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