Results 41 to 50 of about 1,787 (204)

Многомасштабная модель геодинамо: сопряжение крупномасштабной и мелкомасштабной подмоделей

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki
Формирование главного геомагнитного поля обеспечивается работой механизма гидромагнитного динамо — генерации магнитного поля движением проводящей среды. Динамо Земли (геодинамо) управляется конвекцией жидкого металла во внешнем ядре Земли.
Водинчар, Г.М., Фещенко, Л.К.   +1 more
doaj   +1 more source

Rates of Geomagnetic Field Change During Excursions and Reversals

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 10, October 2026.
Abstract The Earth's magnetic field is characterized by complex changes, reflecting various geodynamo processes. Paleomagnetic studies have provided evidence of geomagnetic polarity reversals and excursions throughout Earth's history. We use data‐based paleomagnetic field models (LSMOD.2, GGFSS70, and GGFMB) and the axial dipole moment reconstruction ...
Sunaina Shinu, Ahmed Nasser Mahgoub, Monika Korte   +2 more
wiley   +1 more source

Episodic Change, Quiescence, and Recovery of Earth's Inner Core Surface

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 10, October 2026.
Abstract While a consensus has emerged that the hypothesis of inner core differential rotation cannot provide a consistent explanation for the seismic data, it remains debated whether the seismic data indicate a concurrence of a temporal change of inner core surface with an inner core differential rotation or the temporal change of inner core surface ...
Xin Zhang, Lianxing Wen
wiley   +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

Cambrian Stage 3 Paleomagnetism of the South China Block: Implications for Early Paleozoic Gondwana Reconstructions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 10, October 2026.
Abstract The paleogeographic position of the South China Block (SCB) during the early Paleozoic and its affiliation with Gondwana remain debated. We report new high‐quality paleomagnetic data from sandstone‐dominated Cambrian Stage 3 strata correlated with the Yu'anshan–Hongjingshao succession collected along the southwestern margin of the SCB ...
Dongmeng Zhang, Xin Cheng, Vadim A. Kravchinsky, Mengting Zhong, Bitian Wei, Nan Jiang, Longyun Xing, Shuqi Lan, Weijie Zhang, Jiahui Zhang, Chao Chang, Wei Liu, Yanan Zhou, Xingliang Zhang, Hanning Wu   +14 more
wiley   +1 more source

Geodynamo reversals and numerical simulations

, 2018
Review talk given at the SEDI 2018 (Edmonton, Canada).More than 20 years ago, a stunning computer simulation of the geodynamo, including polarity reversals, has been published.I will attempt to review the progresses made since then in terms of ...
Nathanael Schaeffer (474534)
core   +1 more source

Reconciling Coupled Thermal‐Water Evolution Models of Earth With Observations Through Variable Regassing Efficiency

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Reconciling Earth's thermal evolution with geochemical observations remains a fundamental challenge, as parameterized convection models typically predict high present‐day Urey ratios inconsistent with geochemical estimates. Previous studies propose that if mantle water concentration varies inversely to mantle temperature, it would weaken the ...
Alexander B. Thames, Bradford J. Foley
wiley   +1 more source

Large‐Scale Atomistic Simulations of Magnesium Oxide Exsolution Driven by Machine Learning Potentials: Implications for the Early Geodynamo

Geophysical Research Letters
The precipitation of magnesium oxide (MgO) from the Earth's core has been proposed as a potential energy source to power the geodynamo prior to the inner core solidification. Yet, the stable phase and exact amount of MgO exsolution remain elusive.
Jie Deng
doaj   +1 more source

An introduction to the Geodynamo

, 2021
Introductory lecture about the geodynamo given at the "Ecole de Physique des Houches" https://www.houches-school-physics.com/
openaire   +1 more source

Physics‐Informed Machine Learning Framework to Retroactively Estimate Mantle Thermal Convection From Partial Geophysical Observations

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract Mantle convection drives the solid Earth, powering plate motions, volcanism, and earthquakes while regulating planetary heat loss. Reconstructing its history is hampered by sparse, noisy observations concentrated near the surface and the present day. Here I develop an inverse physics‐informed neural network framework to estimate mantle thermal
Atsushi Nakao
wiley   +1 more source