geodynamo

geodynamo

[‚jē·ō′dī·nə·mō]
(geophysics)
The self-sustaining process responsible for maintaining the earth's magnetic field in which the kinetic energy of convective motion of the earth's liquid core is converted into magnetic energy.
References in periodicals archive ?
This affects convection in the core, and thus the geodynamo - the process that creates the Earth's magnetic field.
The action of the Moon, overlooked until now, is thought to have compensated for this difference and kept the geodynamo active.
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.
Then, shortly after the predicted timing of the core solidification event nearly 650 million years ago, the geodynamo simulations predict that Earth's magnetic field transitioned back to a two-pole system.
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.