Sign of helicity in the $α$-$Ω$ geodynamo

Details Sign of helicity in the $α$-$Ω$ geodynamo Sign of helicity in the $α$-$Ω$ geodynamo

2010-08-02

arxiv.org/abs/1008.0309v5

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Scientific paper

In this paper we discuss the sign of helicity in the $\alpha$-$\Omega$ dynamo
and propose a wave-$\Omega$ model in which the $\alpha$ effect in the geodynamo
is induced by helical wave but not helical flow as in the solar dynamo. We then
tentatively interpret the mechanisms of the Earth's magnetic westward drift,
tilt angle, and dipole reversals.

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