Key Problems of Flat Objects Dynamo Theory and Ways of Their Solution

F. Krause, R. Meinel, D. Elstner, G. Rüdiger
1990 Symposium - International astronomical union  
The present status of galactic dynamo theory is discussed. A new concept which allows the determination of marginal dynamo numbers for axisymmetric as well as non-axisymmetric large-scale magnetic field modes in axisymmetric disks is applied to a simple galaxy model. The results obtained so far show that a preference of non-axisymmetric fields can only be expected if the α-effect is highly anisotropic and the differential rotation is not too strong. Mostly axisymmetric-spiral fields have to be
more » ... fields have to be expected.
doi:10.1017/s0074180900189661 fatcat:akyaa2xyrbbkdplbkwthw6k7eq