## Nonlinear galactic dynamo models with magnetic-supported interstellar gas-density stratification
We demonstrate the ability of a highly simplified galactic model to
generate mean-field magnetic fields. The generated large-scale
magnetic field feeds back to the vertical density stratification which
itself is one of the essentials of the basic
-effect. The non-magnetic part of the stratification is due to the
gravity potential of the stellar component of the galactic disk. The
rotation law of the gas also results from the stellar-disk potential.
A The magnetic field configuration is always even with respect to the equator (quadrupolar) and all models with correlation times longer than 10 Myr are oscillating. Surprisingly enough, the magnetic influence on the vertical
stratification does
## Contents- 1. Introduction
- 2. Basic equations
- 2.1. The turbulent EMF
- 2.2. The -tensor
- 2.3. The -tensor
- 2.4. Vertical stratification
- 3. The dynamo model
- 4. Results for models with turbulence-quenching
- 5. Results for models without any turbulence-quenching
- 6. Discussion
- References
© European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 |