Results 21 to 30 of about 4,233 (235)
Thermal and electrical conductivity of iron at Earth's core conditions [PDF]
, 2012 The Earth acts as a gigantic heat engine driven by decay of radiogenic isotopes and slow cooling, which gives rise to plate tectonics, volcanoes, and mountain building.
A Jackson +41 more
core +2 more sources
Scale disparities and magnetohydrodynamics in the Earth’s core [PDF]
, 2000 Fluid motions driven by convection in the Earth’s fluid core sustain geomagnetic fields by magnetohydrodynamic dynamo processes. The dynamics of the core is critically influenced by the combined effects of rotation and magnetic fields.
Gubbins, D., Zhang, K.
core +1 more source
Can Core Flows inferred from Geomagnetic Field Models explain the Earth's Dynamo? [PDF]
, 2015 We test the ability of large scale velocity fields inferred from geomagnetic secular variation data to produce the global magnetic field of the Earth.Our kinematic dynamo calculations use quasi-geostrophic (QG) flows inverted from geomagnetic field ...
Pais, Maria Alexandra +2 more
core +5 more sources
REVERSALS IN THE 6-CELLS CONVECTION DRIVEN [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2015 We describe the large-scale model geodynamo, which based on indirect data of inhomogeneities in the density of the Earth’s core. Convection structure is associated with spherical harmonic Y24 , which defines the basic poloidal component of velocity ...
G.M. Vodinchar, L.K. Feshenko
doaj +1 more source
Axial invariance of rapidly varying diffusionless motions in the Earth's core interior [PDF]
, 2008 Geostrophic jets propagating as Alfv\'en waves are shown to arise ina rapidly rotating spherical shell permeated by a magnetic field among the transient motions set up by an impulsive rotation of the inner core.
Braginsky +30 more
core +6 more sources
Simulating 2 Ga of geodynamo history
Geophysical Research Letters, 2016 The paleomagnetic record indicates the geodynamo has been active over much of Earth history with surprisingly little trend in paleointensity. Variability, however, is expected from models that predict a sharp increase in intensity following inner core ...
Peter E. Driscoll
doaj +1 more source
Magnetic Helicity and the Geodynamo
Fluids, 2021 We present theoretical and computational results in magnetohydrodynamic turbulence that we feel are essential to understanding the geodynamo. These results are based on a mathematical model that focuses on magnetohydrodynamic (MHD) turbulence, but ...
John V. Shebalin
doaj +1 more source
Geomagnetic Dipole Changes and Upwelling/Downwelling at the Top of the Earth's Core
Frontiers in Earth Science, 2018 The convective state of the top of Earth's outer core is still under debate. Conflicting evidence from seismology and geomagnetism provides arguments for and against a thick stably stratified layer below the core-mantle boundary.
Ludovic Huguet +3 more
doaj +1 more source
Iridium Communications Satellite Constellation Data for Study of Earth's Magnetic Field
Geochemistry, Geophysics, Geosystems, 2021 Characterization of Earth's magnetic field is key to understanding dynamics of the core. We assess whether Iridium Communications magnetometer data can be used for this purpose since.
Brian J. Anderson +7 more
doaj +1 more source
Symposium - International Astronomical Union, 1993 A comparison is made of the differences and similarities between the solar dynamo and the geodynamo. Special attention is paid to the energetics, the dynamics, the role of turbulence, and the α- and ω-sources in these dynamos.
openaire +1 more source