"Here we show that these signatures can be reproduced in numerical simulations of the geodynamo
that realistically account for the interaction between slowcore convection and rapid hydromagnetic waves," Julien Aubert and Christopher C.
The researchers conjectured it was at this point in the geological time scale--or sometime shortly after--that the inner core began to form, giving strength to the geodynamo
The geomagnetic field is a fundamental nature of the planet that is produced by the geodynamo
of the Earth's outer core.
This shield is produced by the geodynamo
, the rapid motion of huge quantities of liquid iron alloy in the Earth's outer core.
Unlike a bar magnet, however, Earth's magnetic field changes over time because it is generated by a geodynamo
(in Earth's case, the motion of molten iron alloys in its outer core).
theory and simulations," Reviews of Modern Physics, vol.
The findings could help us understand how the inner core formed and how the outer core acts as a 'geodynamo
', which generates the planet's magnetic field.
Earth's core and the geodynamo
. Science, 288:2007-2012.
Topics include foundations of dynamo theory, including self-excited dynamo action, nonlinearity and saturation, and dynamics of rotating fluids; natural dynamos and models, including the geodynamo
, planetary dynamos, stellar dynamos, and galactic dynamos; and results of recent experiments.
It will attempt to show a simplified model of the combination of the Earth's magnetic and electrical fields into a self-sustaining geodynamo
. There are three problems from introductory that can be used to demonstrate this model: the magnetic field in a solenoid; the force acting on a current in a magnetic field; and the motional EMF produced in a moving wire.
The Cretaceous Superchron geodynamo
: Observations near the tangent cylinder.