Results 81 to 90 of about 1,787 (204)

Reassessment of electromagnetic core-mantle coupling and its implications to the Earth's decadal polar motion

Geodesy and Geodynamics, 2019
The observed Earth's polar motion on decadal time scales has long been conjectured to be excited by the exchange of equatorial angular momentum between the solid mantle and the fluid outer core, via the mechanism of electromagnetic (EM) core-mantle ...
Weijia Kuang, Benjamin F. Chao, Jianli Chen   +2 more
doaj   +1 more source

Reversals and Large-Scale Variations of the Geomagnetic Field: Similarities and Differences

Russian Journal of Earth Sciences
It is shown that during reversals in geodynamo models the minimum amplitudes of the dipole, quadrupole and octupole coincide. Since the characteristic time of the reversal is close to the oscillations of the large-scale geomagnetic field, a similar ...
Reshetnyak Maxim
doaj   +1 more source

Regular reversals in the six-jet geodynamo model

E3S Web of Conferences, 2018
A low-mode geodynamo model is developed, controlled by 6-jet convection in the core of the Earth. The model contains only four modes, representing the fields of temperature, velocity, and two fields of magnetic induction. The magnetic modes was chosen by
Feshchenko Liubov
doaj   +1 more source

Three distinct reversing modes in the geodynamo

, 2020
© 2016, Pleiades Publishing, Ltd.The data that describe the long-term reversing behavior of the geodynamo show strong and sudden changes in magnetic reversal frequency.
Gallet Y., Pavlov V.
core  

Detecting the oldest geodynamo and attendant shielding from the solar wind: Implications for habitability [PDF]

, 2014
The onset and nature of the earliest geomagnetic field is important for understanding the evolution of the core, atmosphere and life on Earth. A record of the early geodynamo is preserved in ancient silicate crystals containing minute magnetic inclusions.
Mamajek, Eric E., Tarduno, John A., Blackman, Eric G.   +2 more
core   +1 more source

Modelling The Geodynamo: Progress And Challenges

, 2010
It is widely accepted that the Earth’s magnetic field is powered by a convection-driven dynamo operating in its liquid iron core. The twentieth century witnessed remarkable advances in the field of magnetohydro dynamics, which eventually led to three ...
Sreenivasan, Binod
core  

Saturation and time dependence of geodynamo models

, 2010
International audienceIn this study we address the question under which conditions a saturated velocity field stemming from geodynamo simulations leads to an exponential growth of the magnetic field in a corresponding kinematic calculation.
Cameron, R., Schmitt, D., Hoyng, P., M. Schrinner, R. Cameron, D. Schmitt, P. Hoyng, Schrinner, M.   +7 more
core   +1 more source

A >70‐Myr‐Long Geomagnetic Field Reversal Hyperactivity Across the Ediacaran‐Cambrian Transition

Geophysical Research Letters
The long‐term variation of the geomagnetic field is a key constraint for unraveling the geodynamo processes and the evolution of Earth's deep interior.
Fuyun Shen, Bin Wen, Phil J. A. McCausland, Zheng Gong, Zongmin Zhu, Fangzheng Liu, Jingyi Wang   +6 more
doaj   +1 more source

On the mean-field theory of the Karlsruhe Dynamo Experiment [PDF]

Nonlinear Processes in Geophysics, 2002
In the Forschungszentrum Karlsruhe an experiment has been constructed which demonstrates a homogeneous dynamo as is expected to exist in the Earth's interior. This experiment is discussed within the framework of mean-field dynamo theory.
K.-H. Rädler, M. Rheinhardt, E. Apstein, H. Fuchs   +3 more
doaj  

A geodynamo model incorporating a finitely conducting inner core. [PDF]

, 1993
Hollerbach, R. and Jones, C.A., 1993. A geodynamo model incorporating a finitely conducting inner core. Phys. Earth Planet. Inter., A direct spectral solution is presented for the mean-field geodynamo equations.
Chris A Jones, Rainer Hollerbach
core