Dynamo theory
Abstract
A review is conducted of the conditions under which bodies of electrically conducting fluid are selfexcited dynamos with attention given to practical applications of dynamo theory. Dynamo theory is divided into kinematic theory and fully selfconsistent theory; kinematic theory concerns situations in which the velocity field is given, and fully selfconsistent theory uses MHD equations to deduce the magnetic and velocity fields. Specific treatment is given to the conditions of symmetry and brute force in dynamos, and descriptions of alphasquared and alphaomega dynamos are given as well as one for galactic dynamos. The Maximally Efficient Generation Approach and the WKBJ approach are set forth, and some applications are proposed. The methods discussed are of use in the analysis of slow, fast, and turbulent dynamos and permit the examination of dynamos in the context of stability theory.
 Publication:

Annual Review of Fluid Mechanics
 Pub Date:
 1992
 DOI:
 10.1146/annurev.fl.24.010192.002331
 Bibcode:
 1992AnRFM..24..459R
 Keywords:

 Dynamo Theory;
 Kinematics;
 Magnetic Field Configurations;
 Magnetohydrodynamics;
 Rotating Fluids;
 Current Density;
 Electromotive Forces;
 High Reynolds Number;
 Maxwell Equation;
 Physics (General)