Results 71 to 80 of about 3,588 (211)

Archeointensity Database and Geomagnetic Field Reference Curves for South America Over the Past 5 Millennia

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract The study of variations in geomagnetic field intensity over time and space is crucial to understand the evolution of the geodynamo and its interactions with the Earth's surface. In this work, we introduce the SAGEOMAG (South America GEOMAGnetic) database, a comprehensive and updated repository of geomagnetic field intensity records derived ...
Victor J. O. Marum, Filipe Terra‐Nova, Gelvam A. Hartmann, Erwan Thébault, Plinio Jaqueto, Wilbor Poletti, Ricardo I. F. Trindade   +6 more
wiley   +1 more source

Preface to the Special Issue of Initial Scientific Results of MSS-1

Earth and Planetary Physics
The scientific research of geomagnetism has been largely driven by new geomagnetic data that are available to scientists. Macau Science Satellite-1 (MSS-1) was successfully launched on 21st May 2023 into a near-circular orbit of altitude of about 450 km ...
Keke Zhang, PengFei Liu, YongXin Pan
doaj   +1 more source

Mantle cooling regulation and ancient geomagnetic field

Russian Journal of Earth Sciences, 2022
The joined core and mantle thermal evolution model of the Earth for 6 Gy is considered. The model describes evolution of the heat fluxes, temperature distribution in the Earth, energy available for the magnetic field generation. Using Monte Carlo method
Reshetnyak Maxim
doaj   +1 more source

Thermal and electrical conductivity of iron at Earth's core conditions [PDF]

, 2012
The Earth acts as a gigantic heat engine driven by decay of radiogenic isotopes and slow cooling, which gives rise to plate tectonics, volcanoes, and mountain building.
A Jackson, AM Dziewonski, AP Anufriev, B Buffett, BA Buffett, Chris Davies, CJ Davies, D Alfè, D Alfè, D Alfè, D Alfè, D Alfè, D Gubbins, D Gubbins, D Gubbins, D Gubbins, Dario Alfè, David Gubbins, FD Stacey, G Davies, G Davies, G Kresse, G Kresse, JR Lister, K Hirose, M Pozzo, Monica Pozzo, MP Desjarlais, N de Koker, P Olson, PE Blöchl, PL Silvestrelli, RN Keeler, S Labrosse, T Lay, T Nakagawa, TG Masters, TR Mattsson, W Kuang, W McDonough, Y Bi, Y Wang   +41 more
core   +2 more sources

Evidence for Missing Geomagnetic Reversals From Geomagnetic Reversal Frequency Model Using Adaptive Kernel Density Estimation

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract The existence of missing geomagnetic reversals has been proposed, with potential for new magnetostratigraphic age controls. We estimate geomagnetic reversal frequency from 0 to 155 Ma using adaptive‐bandwidth kernel density estimation (AKDE) to evaluate data sparseness and to assess how reversal frequency changes when recently identified ...
Yutaka Yoshimura, Masakazu Fujii, Hideitsu Hino, Shotaro Akaho, Satoshi Kuriki, Osamu Ishizuka, Toshitsugu Yamazaki, Hyeon‐Seon Ahn, Tesfaye Kidane, Yuhji Yamamoto, Yo‐ichiro Otofuji   +10 more
wiley   +1 more source

Double-diffusive convection in a rotating cylindrical annulus with conical caps [PDF]

, 2011
Double-diffusive convection driven by both thermal and compositional buoyancy in a rotating cylindrical annulus with conical caps is considered with the aim to establish whether a small fraction of compositional buoyancy added to the thermal buoyancy (or
Simitev, R. D.
core   +3 more sources

Self‐Consistent Models of Earth's Mantle and Core From Long‐Period Seismic and Tidal Constraints

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract Here we illustrate the use of parameterized models to address fundamental questions about Earth's mantle and core structure. For this, we invert a large set of normal‐mode center frequencies and quality (attenuation) factors, along with astronomic‐geodetic data, for the radial anelastic seismic structure of the Earth.
F. D. Munch, J. Kemper, A. Khan, G. Helffrich, D. Giardini   +4 more
wiley   +1 more source

Quasi-geostrophic kinematic dynamos at low magnetic Prandtl number [PDF]

, 2004
Rapidly rotating spherical kinematic dynamos are computed using the combination of a quasi geostrophic (QG) model for the velocity field and a classical spectral 3D code for the magnetic field. On one hand, the QG flow is computed in the equatorial plane
Cardin, Philippe, Schaeffer, Nathanael
core   +2 more sources

Sensitivity of the Geomagnetic Octupole to a Stably Stratified Layer in the Earth's Core

, 2018
Current "Earth-like" numerical dynamo simulations are able to reproduce many characteristics of the observed geomagnetic field. One notable exception is the geomagnetic octupolar component. Here we investigate whether a stably stratified layer at the top
Stanley, Sabine, Yan, Chi
core   +1 more source

Early Cretaceous absolute geomagnetic paleointensities from Córdoba province (Argentina) [PDF]

, 2006
We present here new paleointensity and geochronology results from Early Cretaceous volcanic rocks of Sierra Chica de Cordoba (Argentina). The new K-Ar isotopic ages of 5 samples range from 136 to 122 Ma.
Alva-Valdivia, Luis M., Cejudo Ruiz, Ruben, Geuna, Silvana Evangelina, Goguitchaichvili, Avto, Morales, Juan, Solé, Jesus   +5 more
core   +1 more source