Results 41 to 50 of about 3,588 (211)

The clustering of polarity reversals of the geomagnetic field

, 2006
Often in nature the temporal distribution of inhomogeneous stochastic point processes can be modeled as a realization of renewal Poisson processes with a variable rate.
A. Kageyama, A. Vecchio, D. L. Turcotte, D. V. Kent, F. Lepreti, H. K. Moffatt, I. Guerra, J. R. Heirtzler, L. Sorriso-Valvo, P. Harabaglia, P. Veltri, P. L. McFadden, R. Hollerbach, R. T. Merril, S. P. Huestis, T. Rikitake, V. Carbone, W. Feller   +17 more
core   +1 more source

A Hierarchical Bayesian Model for the Global Holocene Geomagnetic Field

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract We present a hierarchical Bayesian model of the global geomagnetic field for the last 8,000 years. The model is built solely with thermoremanent records, which include archeomagnetic and volcanic data. Building upon previous work, this model includes fewer approximations and treats model hyperparameters as probabilistic variables.
M. A. Schanner, S. Panovska, M. Korte
wiley   +1 more source

The Magnetic Sun: Reversals and Long-Term Variations

, 2010
A didactic introduction to current thinking on some aspects of the solar dynamo is given for geophysicists and planetary scientists.Comment: 17 pages, 9 figures; Space Science Rev., in ...
A. Brandenburg, A.-M. Berggren, A.R. Choudhuri, A.R. Choudhuri, C.C. Finlay, D. Moss, D. Nandy, E.N. Parker, E.N. Parker, E.N. Parker, F. Moreno-Insertis, F. Moreno-Insertis, H.C. Spruit, H.W. Babcock, I.G. Usoskin, I.G. Usoskin, I.G. Usoskin, J. Aubert, J. Beer, J. Beer, J. Bloxham, J. Mason, J. Wicht, J.-F. Donati, J.A. Markiel, J.M. Brooke, K. Petrovay, K. Petrovay, K. Petrovay, K. Petrovay, L. van Driel-Gesztelyi, M. Dikpati, M. Dikpati, M.A.J.H. Ossendrijver, P. Caligari, P. Charbonneau, P. Charbonneau, R. Howe, R.B. Leighton, S. D’Silva, S. Solanki, S.M. Tobias, U. R. Christensen, U.R. Christensen, U.R. Christensen, U.R. Christensen, Y. Fan   +46 more
core   +1 more source

Sulfur‐Bearing hcp Iron for Earth's Inner Core

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Earth's iron core is believed to contain light impurities which should have been included during core formation. In order to place constraints on core composition, here we report the effect of sulfur on density of hexagonal close‐packed (hcp) iron which was not previously examined, using laser‐heated diamond anvil cells with in situ ...
Emiko Sugimura‐Komabayashi, Samuel Thompson, Tetsuya Komabayashi, Damien Freitas, Mark Robertson, Nico Giordano, Anna Pakhomova, Hanns‐Peter Liermann   +7 more
wiley   +1 more source

База данных параметров базисных мод и коэффициентов cпектральных моделей геодинамо

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki
Спектральные модели геодинамо строятся на основании конечного набора базисных стационарных полей (мод). Поля скорости, температуры и магнитной индукции представляются в моделях в виде линейных комбинаций базисных мод с коэффициентами (амплитудами ...
Водинчар, Г.М., Казаков, Е.А., Лисюткин, С.С.   +2 more
doaj   +1 more source

Determining Magnetic Field Intensity and Direction From the Anisotropy of Magnetic Remanence in Sediments

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract Anisotropy of magnetic remanence (AMR) holds promise for quantifying relative paleointensity values from sedimentary rocks. A proof of concept was established for applied fields that exceeded the intensity of the geomagnetic field. Under Earth‐like fields, large uncertainties necessitate the development of a new approach to improve the ...
Felix K. Ostermeier, Stuart A. Gilder, Michael R. Wack, Josef Ježek, Kuang He, David Finn   +5 more
wiley   +1 more source

Комплекс программ моделирования геодинамо на основе спектральных эредитарных моделей

Vestnik KRAUNC: Fiziko-Matematičeskie Nauki
Исследование задачи геодинамо часто проводят на основе спектральных моделей, когда поля задачи полностью или частично раскладываются по собственным полям (модам) подходящих спектральных задач.
Водинчар, Г.М., Казаков, Е.А., Фещенко, Л.К.   +2 more
doaj   +1 more source

A Model of the Geodynamo [PDF]

Geophysical Journal of the Royal Astronomical Society, 2007
Summary The problem of the generation of the geomagnetic field by convection in the Earth's core is considered. The complete hydromagnetic problem including the Lorentz force is solved in the case of a cylindrical configuration. Because of the dominant effect of rotation this configuration incorporates the essential features of the dynamo process in
openaire   +2 more sources

Pressure Dependence of Liquid Iron Viscosity From Machine‐Learning Molecular Dynamics

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract We have developed a machine‐learning potential that accurately models the behavior of iron under the conditions of Earth's core. By performing numerous nanosecond scale equilibrium molecular dynamics simulations, the viscosities of liquid iron for the whole outer core conditions are obtained with much less uncertainty.
Kai Luo, Xuyang Long, R. E. Cohen
wiley   +1 more source

High Geomagnetic Reversal Frequency During the Middle to Late Ediacaran (∼570 Ma) Constrained by Integrated Magneto‐ and Cyclostratigraphy

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract The Ediacaran–Cambrian (∼635–539 Ma) geomagnetic field is characterized by unusually high reversal rates and markedly weakened field strength. Estimates of these reversal frequencies can reveal key aspects of deep Earth dynamics and their potential influence on surface environments and early complex life.
J. W. L. Afonso, R. M. Rocha, D. R. Franco, N. B. Dos Santos, C. G. Leandro, P. Franceschinis, A. E. Rapalini, M. J. Arrouy, L. E. Gómez‐Peral, D. G. Poiré, S. Caetano‐Filho, H. D. Brito, R. I. F. Trindade   +12 more
wiley   +1 more source