What can we say about seed fields for galactic dynamos?
Astrophysics of Galaxies
2015-06-11 v1
Abstract
We demonstrate that a quasi-uniform cosmological seed field is a much less suitable seed for a galactic dynamo than has often been believed. The age of the Universe is insufficient for a conventional galactic dynamo to generate a contemporary galactic magnetic field starting from such a seed, accepting conventional estimates for physical quantities. We discuss modifications to the scenario for the evolution of galactic magnetic fields implied by this result. We also consider briefly the implications of a dynamo number that is significantly larger than that given by conventional estimates.
Keywords
Cite
@article{arxiv.1208.3666,
title = {What can we say about seed fields for galactic dynamos?},
author = {Dmitri Sokoloff and David Moss},
journal= {arXiv preprint arXiv:1208.3666},
year = {2015}
}