Results 31 to 40 of about 1,386 (209)

Prandtl-number dependence of convection-driven dynamos in rotating spherical fluid shells [PDF]

, 2005
The value of the Prandtl number P exerts a strong influence on convection-driven dynamos in rotating spherical shells filled with electrically conducting fluids.
Simitev, R., Busse, F.H.
core   +1 more source

NUMERICAL SIMULATION IN LOW MODED GEODYNAMOMODEL APPLYING THE PACKAGES OF HIGH PRECISION CALCULATION [PDF]

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2011
The means of high precision calculation are considered, their comparative analysis isfulfilled, application of the most efficient of them for the geodynamo task is regardered.
A.S. Chemarev, G.M. Vodinchar, A.B. Tristanov   +2 more
doaj   +1 more source

On the Precession Driven Geodynamo [PDF]

Izvestiya, Physics of the Solid Earth, 2006
Formation of flow structures in the Earth’s liquid core enclosed in a precessing and rotating shell (mantle) is examined within the hydrodynamic approach. The kinematics and energetics of the motions in the Earth’s core initiated by precession allow one to regard these motions as a possible geodynamo mechanism at an early evolutionary stage of the ...
openaire   +1 more source

Probabilistic structure of the geodynamo

Physical Review E, 2018
One of the most intriguing features of Earth's axial magnetic dipole field, well-known from the geological record, is its occasional and unpredictable reversal of polarity. Understanding the phenomenon is rendered very difficult by the highly non-linear nature of the underlying magnetohydrodynamic problem. Numerical simulations of the liquid outer core,
Scullard, Christian R, Buffett, Bruce A
openaire   +5 more sources

The geodynamo for non-geophysicists

, 2020
The geodynamo usually appears as a somewhat intimidating subject. Its understanding seems to require knowledge of the intricate theory of magnetohydrodynamics. The solution of the corresponding equations can only be achieved numerically. It seems to be a
Herrmann, Friedrich, Vorbach, Tobias
core   +1 more source

The Cretaceous Normal Superchron: A Mini-Review of Its Discovery, Short Reversal Events, Paleointensity, Paleosecular Variations, Paleoenvironment, Volcanism, and Mechanism

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

Stochastic Models of Geodynamo Simulations [PDF]

, 2022
The Earth's magnetic field originates primarily in the interior of the planet, and represents one of the few signals through which processes of the deep Earth are expressed at the surface.
Davis, William
core  

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

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.
Brodholt, J., Nimmo, F., Price, G.D., Gubbins, D.   +3 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