Results 71 to 80 of about 1,787 (204)

PSVM: A Global Database for the Miocene Indicating Elevated Paleosecular Variation Relative to the Last 10 Myrs

Geochemistry, Geophysics, Geosystems, 2022
Statistical studies of paleosecular variation (PSV) are used to infer the structure and behavior of the geomagnetic field. This study presents a new database, paleosecular variation of the Miocene (PSVM), of high‐quality directional data from the Miocene
Y. A. Engbers, R. K. Bono, A. J. Biggin
doaj   +1 more source

Thermal Evolution of the Sulfur‐Rich, Small Terrestrial Planetary Core as Inferred From the Experimental Study of the Fe‐S‐O‐H System

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract The cores of rocky planets, including the Earth, are believed to contain light elements such as silicon, oxygen, sulfur, hydrogen, and carbon. Amongst them, sulfur appears to be rich in the cores of small terrestrial bodies like Mars and Ganymede. To understand the evolution of sulfur‐rich cores in the presence of other light elements, we have
Jeongmin Lee, Jaeyoon Keum, Taehyun Kim, Chanbi Lee, Stella Chariton, Vitali Prakapenka, Nico Giordano, Byungdal So, Huijeong Hwang, Yongjae Lee   +9 more
wiley   +1 more source

Mercury's Tectonic and Geodynamic History: 1. Contractional Tectonic Landform Analysis and Tectonic Strain Using Machine Learning

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Mercury's tectonic record is dominated by shortening landforms, including lobate scarps, high‐relief ridges and wrinkle ridges. Previous analyses of these structures have used displacement–length ratios to constrain the planet's global contraction to a range of either no more than 2 km or up to 7 km.
A. Broquet, J. C. Andrews‐Hanna
wiley   +1 more source

Motional Induction in Ganymede's Ocean

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract We investigate the magnetic signature of oceanic circulation in Ganymede's subsurface ocean using kinematic induction modeling. Our approach couples zonal jet flows from rotating thermal convection simulations with magnetic field models incorporating Ganymede's internal dynamo and external contributions from Jupiter.
Simon Cabanes, Thomas Gastine, Alexandre Fournier   +2 more
wiley   +1 more source

Magnetic effects on fields morphologies and reversals in geodynamo simulations

, 2020
International audienceThe dynamo eect is the most popular candidate to explain the non-primordial magnetic elds of astrophysical objects. Although many systematic studies of parameters have already been made to determine the dierent dynamical regimes ...
Petitdemange, Ludovic, Menu, Mélissa, D, Galtier, Sebastien   +2 more
core   +1 more source

Superdipole Geomagnetic Field in the Past

Russian Journal of Earth Sciences
According to the model of the Earth’s cooling, before the solid core origin, there was a sub-adiabatic layer at the core-mantle boundary several hundred kilometers thick. In this layer magnetic field generation was suppressed.
Reshetnyak Maxim
doaj   +1 more source

Scaling of Latitude‐Dependent Heat Transport in Geostrophic Convection

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Latitudinal variations in heat transport shape the thermal and magnetic evolution of rapidly rotating planets, stars, and icy moons. Although global simulations have revealed strong equatorial–polar contrasts, a predictive scaling theory has been lacking.
Veeraraghavan Kannan, Varghese Mathai, Xiaojue Zhu   +2 more
wiley   +1 more source

Decadal Stability of Multi‐Scale Core‐Mantle Boundary in Core‐Reflections of Repeating Earthquakes

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Temporal changes near the core‐mantle boundary (CMB) would trigger insights into ongoing thermal and chemical interactions between the Earth's core and mantle. Here, we search for multidecadal temporal changes in the CMB topography and heterogeneity using waveform similarity analysis of core‐reflected phases (PcP, ScP, and ScS) from global ...
Tianyu Cui, Wei Wang, John E. Vidale, Hao Zhang, Hao Luo, Yinshuang Ai   +5 more
wiley   +1 more source

A Global Paleosecular Variation Database for the Paleogene: Stationary Secular Variation Behavior Since the Triassic?

Geochemistry, Geophysics, Geosystems
Paleosecular variation analysis is a primary tool for characterizing ancient geomagnetic behavior and its evolution through time. This study presents a new high‐quality directional data set, paleosecular variation of the Paleogene (PSVP), with and ...
Y. A. Engbers, D. Thallner, R. K. Bono, C. J. Sprain, M. J. Murray, K. Bristol, B. Handford, T. Torsvik, A. J. Biggin   +8 more
doaj   +1 more source

Magnetohydrodynamic turbulence and the geodynamo [PDF]

Physics of the Earth and Planetary Interiors, 2018
Abstract Ideal magnetohydrodynamic (MHD) turbulence contains an intrinsic statistical mechanism called ‘broken ergodicity’ for producing an energetic, large-scale, quasi-stationary coherent structure. Since MHD turbulence occurs in the Earth’s liquid outer core, the implication is that the Earth’s dipole magnetic field may be due to MHD turbulence ...
openaire   +1 more source