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The saturation of galactic dynamos

✍ Scribed by D. Moss; D. Sokoloff

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
76 KB
Volume
332
Category
Article
ISSN
0004-6337

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✦ Synopsis

Abstract

We summarize the current state of the long term discussion about the saturation mechanisms associated with rapid growth of small‐scale magnetic field, that operate in large‐scale galactic dynamos, and related problems with magnetic helicity conservation. Our general conclusion is that, taking into account magnetic helicity fluxes, large‐scale magnetic field can be amplified up to about the equipartition level. In contrast, models without helicity fluxes give an initial temporal magnetic field growth, but then decay. In our opinion, it is more appropriate to refer to the situation as a “potentially catastrophic scenario” rather than as “catastrophic α‐quenching” (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

📜 SIMILAR VOLUMES

The nonlinear galactic dynamo and magnet
The nonlinear galactic dynamo and magnetic helicity transport
✍ N. Kleeorin; D. Moss; I. Rogachevskii; D. Sokoloff 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 75 KB 👁 1 views

## Abstract We discuss nonlinear mean‐field galactic dynamo models and associate a universal mechanism for saturation of the dynamo with the transport of magnetic helicity. The crucial point for saturation of the dynamo is the existence of a non‐zero flux of magnetic helicity. We demonstrate that t