Magnetic helicity fluxes in alpha Omega dynamos

Details Magnetic helicity fluxes in alpha Omega dynamos Magnetic helicity fluxes in alpha Omega dynamos

2010-12-20

arxiv.org/abs/1012.4354v3

Advances in Plasma Astrophysics, Vol. 6, IAU Symp. S274, pp. 464-466 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

3 pages, 6 figures, proceedings of IAU Symp. 274, Advances in Plasma Astrophysics, ed. A. Bonanno, E. de Gouveia dal Pino and

Scientific paper

10.1017/S1743921311007502

In turbulent dynamos the production of large-scale magnetic fields is accompanied by a separation of magnetic helicity in scale. The large- and small-scale parts increase in magnitude. The small-scale part can eventually work against the dynamo and quench it, especially at high magnetic Reynolds numbers. A one-dimensional mean-field model of a dynamo is presented where diffusive magnetic helicity fluxes within the domain are important. It turns out that this effect helps to alleviate the quenching. Here we show that internal magnetic helicity fluxes, even within one hemisphere, can be important for alleviating catastrophic quenching.

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