Predictions of numerical geodynamo
simulations will be tested against the data.
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).
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
Sculptures range in size from 30x20x15mm to 75x75x225mm and subjects may be anything from The Milky Way Galaxy [$65], The Geodynamo
[$95] depicting Earth's magnetic field, to a variety of proteins, such as DNA [$50/$100].
Many of such questions relate directly or indirectly to issues that are currently a focus of attention: global change, past climate extremes, complex Earth systems, geochemical fluxes, planetary evolution, geodynamics, core and mantle evolution, the geodynamo
, mantle plumes, flood volcanism, extinction events, potential relationships with large impacts, and discovery of new strategic mineral resources.
No convincing models of the geodynamo
that satisfy all of the observations have yet been demonstrated.
In particular launched the 22nd November 2013 Swarm aims at providing an unique view inside Earth to study: a AoCore dynamics geodynamo
processes and core-mantle interaction; a AoMagnetism of the lithosphere and its geological context; a Ao3D electrical conductivity related to mantle composition; As well as to study the Sun s influence on the Earth system by: a AoAnalysing electric currents in the magnetosphere and ionosphere; a AoUnderstanding the impact of solar wind on the dynamics of the upper atmosphere ; Due to its very innovative concept and unique data the full exploitation of Swarm data will require a dedicated effort to explore its full potential from both a scientific and an operational perspective.
The finding provides physical evidence that the geodynamo
model is on the right track, according to Buffett.
Geophysicists have recently made strides modeling the geodynamo
with large computers (SN: 10/19/96, p.
That's why Glatzmaier and Roberts have attempted to create a virtual version of the geodynamo
, which they run at the Pittsburgh Supercomputing Center and at Los Alamos.
This enables the heat engine in the core to drive the geodynamo
harder, and as the flux of energy to the geodynamo
increases, the reversal rate increases as well.