Importance of magnetic helicity in dynamos

Details Importance of magnetic helicity in dynamos Importance of magnetic helicity in dynamos

2004-12-15

arxiv.org/abs/astro-ph/0412366v1

in Cosmic magnetic fields, ed. R. Wielebinski & R. Beck, Springer, pp. 219-253 (2005)

Astronomy and Astrophysics

Astrophysics

to appear in "Cosmic magnetic fields", eds. R. Wielebinski & R. Beck

Scientific paper

10.1007/11369875_9

Magnetic helicity is nearly conserved and its evolution equation provides a dynamical feedback on the alpha effect that is distinct from the conventional algebraic alpha quenching. The seriousness of this dynamical alpha quenching is particularly evident in the case of closed or periodic boxes. The explicit connection with catastrophic alpha quenching is reviewed and the alleviating effects of magnetic and current helicity fluxes are discussed.

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