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Mathematics, 2023 Spectral models are often used in the study of geodynamo problems. Physical fields in these models are presented as stationary basic modes combinations with time-dependent amplitudes. To construct a model it is necessary to calculate the modes parameters,
Gleb Vodinchar, Liubov Feshchenko
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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
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The effect of model errors in ensemble sequential assimilation of geomagnetic field
Earth and Planetary Physics, 2023 Earth’s magnetic field is generated in the fluid outer core through the dynamo process. Over the last decade, data assimilation has been used to retrieve the core dynamics and predict the evolution of the geomagnetic field.
JinFeng Li, YuFeng Lin, KeKe Zhang
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Symposium - International Astronomical Union, 1993 A comparison is made of the differences and similarities between the solar dynamo and the geodynamo. Special attention is paid to the energetics, the dynamics, the role of turbulence, and the α- and ω-sources in these dynamos.
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REVERSALS IN THE 6-CELLS CONVECTION DRIVEN [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2015 We describe the large-scale model geodynamo, which based on indirect data of inhomogeneities in the density of the Earth’s core. Convection structure is associated with spherical harmonic Y24 , which defines the basic poloidal component of velocity ...
G.M. Vodinchar, L.K. Feshenko
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Decoding the Geodynamo: Quantitative Dependence of Magnetic Field Diagnostics on Dimensionless Control Parameters [PDF]
EPJ Web of ConferencesUnderstanding how planetary magnetic fields are generated and sustained requires careful analysis of how key physical quantities respond to changes in the underlying control parameters.
Peqini Klaudio +4 more
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Probabilistic structure of the geodynamo
Physical Review E, 2018 One of the most intriguing features of Earth's axial magnetic dipole field, well-known from the geological record, is its occasional and unpredictable reversal of polarity. Understanding the phenomenon is rendered very difficult by the highly non-linear nature of the underlying magnetohydrodynamic problem. Numerical simulations of the liquid outer core,
Scullard, Christian R, Buffett, Bruce A
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Iridium Communications Satellite Constellation Data for Study of Earth's Magnetic Field
Geochemistry, Geophysics, Geosystems, 2021 Characterization of Earth's magnetic field is key to understanding dynamics of the core. We assess whether Iridium Communications magnetometer data can be used for this purpose since.
Brian J. Anderson +7 more
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Three distinct reversing modes in the geodynamo [PDF]
, 2016 International audienceThe data that describe the long-term reversing behavior of the geodynamo show strong and sudden changes in magnetic reversal frequency.
Pavlov, V. E., Gallet, Y.
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Paleomagnetic Biases Inferred From Numerical Dynamos and the Search for Geodynamo Evolution
Frontiers in Earth Science, 2018 The paleomagnetic record is central to our understanding of the history of the Earth. The orientation and intensity of magnetic minerals preserved in ancient rocks indicate the geodynamo has been alive since at least the Archean and possibly the Hadean ...
Peter E. Driscoll, Cian Wilson
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