Nearly symmetric hydromagnetic dynamos

Details Nearly symmetric hydromagnetic dynamos Nearly symmetric hydromagnetic dynamos

Jun 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pepi....1..288t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 1, Issue 4, p. 288-296.

Physics

20

Scientific paper

Most theoretical studies of homogeneous dynamos are concerned with the kinematic problem. This consists in selecting a flow for the body of conducting fluid concerned (e.g. the Earth's core), and attempting to determine whether it can maintain a magnetic field indefinitely against ohmic losses. In this paper, the (more difficult but more realistic) hydromagnetic dynamo is studied, i.e. starting from a selected body force, an attempt is made to solve the equations of fluid motion and electromagnetic induction simultaneously and obtain a permanent magnetic field. It is shown that certain remarkable simplifications, which Braginskiĭ discovered for a class of kinematic dynamos in which the flow is almost axially symmetric, occur also for a class of hydromagnetic dynamos in which the fluid body is rapidly rotating.

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