Earth's core internal dynamics 1840-2010 imaged by inverse geodynamo modelling

Topographic Core-Mantle coupling in Geodynamo modeling

A 3-dimensional, fully nonlinear numerical geodynamo model is used to study the core-mantle coupling arising from a non-hydrostatic pressure field acting on an aspherical core-mantle boundary (CMB) based on a seismological model. The simulation results demonstrate that the topographic coupling torque is close to being proportional to the square of the amplitude of the CMB topography. We conclud...

Properties and Evolution of the Earth’s Core and Geodynamo

We review recent advances in the study of the Earth’s iron core, focusing on three areas: the properties of the core-forming materials, the manner in which core motions generate the Earth’s magnetic field (the dynamo), and the evolution of both the core and the dynamo. Ab initio computer simulations of the behaviour of iron alloys under core conditions suggest that the inner (solid) and outer (...

The influence of potassium on core and geodynamo evolution

S U M M A R Y We model the thermal evolution of the core and mantle using a parametrized convection scheme, and calculate the entropy available to drive the geodynamo as a function of time. The cooling of the core is controlled by the rate at which the mantle can remove heat. Rapid core cooling favours the operation of a geodynamo but creates an inner core that is too large; slower cooling redu...

Interference in Learning Internal Models of Inverse Dynamics in Humans

Experiments were performed to reveal some of the computational properties of the human motor memory system. We show that as humans practice reaching movements while interacting with a novel mechanical environment, they learn an internal model of the inverse dynamics of that environment. Subjects show recall of this model at testing sessions 24 hours after the initial practice. The representatio...

Modelling Multi-context Robot Inverse Dynamics with Gaussian Processes