Results 31 to 40 of about 4,233 (235)
The influence of potassium on core and geodynamo evolution [PDF]
, 2004 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.
Abramowitz +19 more
core +1 more source
Can the Earth's dynamo run on heat alone? [PDF]
, 2003 The power required to drive the geodynamo places significant constraints on the heat passing across the core-mantle boundary and the Earth's thermal history. Calculations to date have been limited by inaccuracies in the properties of liquid iron mixtures
Alfè +12 more
core +1 more source
The dynamics and excitation of torsional waves in geodynamo simulations [PDF]
, 2013 The predominant force balance in rapidly rotating planetary cores is between Coriolis, pressure, buoyancy and Lorentz forces. This magnetostrophic balance leads to a Taylor state where the spatially averaged azimuthal Lorentz force is compelled to vanish
Jones, Chris A. +2 more
core +2 more sources
Convection–driven geodynamo models [PDF]
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2000 Summary: There has been significant progress in the development of numerical geodynamo models over the last five years. Advances in computer technology have made it possible to perform three-dimensional simulations, with thermal or compositional convection as the driving mechanism.
openaire +1 more source
Asymmetric Dipole Trends in Geodynamo Models and the Paleomagnetic Field
Geochemistry, Geophysics, Geosystems, 2023 Temporal trends in the paleomagnetic dipole moment exhibit the property of positive skewness. On average, positive trends are larger and occur less frequently than negative trends over timescales of several tens of kyr.
B. A. Buffett
doaj +1 more source
Frontiers in Earth Science, 2022 The Cretaceous Normal Superchron (CNS) was first defined in the 1960s to explain the Cretaceous Quiet Zone in marine magnetic anomaly profiles, which includes no or fewer geomagnetic reversals.
Yutaka Yoshimura
doaj +1 more source
Effects of anisotropy in geostrophic turbulence [PDF]
, 2009 The Boussinesq model of convection in a flat layer with heating from below is considered. We analyze the effects of anisotropy caused by rapid rotation in physical and wave spaces and demonstrate the suppression of energy transfer by rotation.
Alexakis +37 more
core +1 more source
Paleomagnetic Biases Inferred From Numerical Dynamos and the Search for Geodynamo Evolution
Frontiers in Earth Science, 2018 The paleomagnetic record is central to our understanding of the history of the Earth. The orientation and intensity of magnetic minerals preserved in ancient rocks indicate the geodynamo has been alive since at least the Archean and possibly the Hadean ...
Peter E. Driscoll, Cian Wilson
doaj +1 more source
Gross thermodynamics of two-component core convection [PDF]
, 2004 We model the inner core by an alloy of iron and 8 per cent sulphur or silicon and the outer core by the same mix with an additional 8 per cent oxygen.
Alfè +31 more
core +1 more source
Geodynamo and mantle convection simulations on the Earth Simulator using the Yin-Yang grid
, 2005 We have developed finite difference codes based on the Yin-Yang grid for the geodynamo simulation and the mantle convection simulation. The Yin-Yang grid is a kind of spherical overset grid that is composed of two identical component grids. The intrinsic
Akira Kageyama +14 more
core +1 more source