Galactic dynamo simulations
Abstract
Recent simulations of supernova-driven turbulence within the ISM support the existence of a large-scale dynamo. With a growth time of about two hundred million years, the dynamo is quite fast - in contradiction to many assertions in the literature. We here present details on the scaling of the dynamo effect within the simulations and discuss global mean-field models based on the adopted turbulence coefficients. The results are compared to global simulations of the magneto-rotational instability.
- Publication:
-
Cosmic Magnetic Fields: From Planets, to Stars and Galaxies
- Pub Date:
- April 2009
- DOI:
- 10.1017/S1743921309031135
- arXiv:
- arXiv:0901.4929
- Bibcode:
- 2009IAUS..259..467E
- Keywords:
-
- ISM: magnetic fields;
- galaxies: magnetic fields;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 10 pages, 5 figures, IAU Symp. 259 proceedings (in press)