期刊
PHYSICAL REVIEW E
卷 80, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.80.035302
关键词
astrophysical fluid dynamics; astrophysical magnetic fields; magnetohydrodynamics; planetary magnetism; rotational flow; stellar magnetism; stellar rotation
We show that hemispherical dynamos can result from weak equatorial symmetry breaking of the flow in the interior of planets and stars. Using a model of spherical dynamo, we observe that the interaction between a dipolar and a quadrupolar mode can localize the magnetic field in only one hemisphere when the equatorial symmetry is broken. This process is shown to be related to the one that is responsible for reversals of the magnetic field. These seemingly very different behaviors are thus understood in a unified framework.
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