Mercury's anomalous magnetic field caused by a symmetry-breaking self-regulating dynamo.

ABSTRACT: The discovery of Mercury's unusually axisymmetric, anomalously axially offset dipolar magnetic field reveals a new regime of planetary magnetic fields. The cause of the offset dipole remains to be resolved, although some exotic models have been proposed. Deciphering why Mercury has such an anomalous field is crucial not only for understanding the internal dynamics, evolutionary history and origin of the planet, but also for establishing the general dynamo theory. Here we present numerical dynamo models, where core convection is driven as thermo-compositional, double-diffusive convection surrounded by a thermally stably stratified layer. We show that the present models produce magnetic fields similar in morphology and strength to that of Mercury. The dynamo-generated fields act on the flow

SUBMITTER: Takahashi F 

PROVIDER: S-EPMC6331596 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature