Results 1 to 10 of about 3,588 (211)
Late Cambrian geomagnetic instability after the onset of inner core nucleation [PDF]
Nature Communications, 2023 The Ediacaran Period marks a pivotal time in geodynamo evolution when the geomagnetic field is thought to approach the weak state where kinetic energy exceeds magnetic energy, as manifested by an extremely high frequency of polarity reversals, high ...
Yong-Xiang Li +7 more
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Geophysical Research Letters, 2019 In a metal, as in Earth's core, the thermal and electrical conductivities are assumed to be correlated. In a planetary dynamo this implies a contradiction: that both electrical conductivity, which makes it easier to induce current and magnetic field, and
Peter E. Driscoll, Zhixue Du
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Simulating 2 Ga of geodynamo history
Geophysical Research Letters, 2016 The paleomagnetic record indicates the geodynamo has been active over much of Earth history with surprisingly little trend in paleointensity. Variability, however, is expected from models that predict a sharp increase in intensity following inner core ...
Peter E. Driscoll
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Extraordinarily long duration of Eocene geomagnetic polarity reversals [PDF]
Communications Earth & EnvironmentOne of the most intriguing attributes of Earth’s magnetic field is that it reverses polarity. Previous palaeomagnetic records mainly from the last ~17 million years indicate that the reversal process typically occurs over ten thousand or fewer years ...
Yuhji Yamamoto +3 more
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Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth’s dynamo [PDF]
Communications Earth & EnvironmentLight volatile elements in the lunar regolith are thought to be a mixture of the solar wind and Earth’s atmosphere, the latter sourced in the absence of geomagnetic field.
Shubhonkar Paramanick +3 more
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Advances in geodynamo modelling
Geophysical and Astrophysical Fluid Dynamics, 2019 ABSTRACTThis paper reviews the remarkable developments in numerical geodynamo simulations over the last few years. Simulations with Ekman numbers as low as E=10−8E=10−8 are now within reach and more and more details of the observed field are recovered by computer models.
Johannes Wicht, Sabrina Sanchez
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Indicators of mantle control on the geodynamo from observations and simulations
Frontiers in Earth Science, 2022 There has been longstanding controversy about whether the influence of lateral variations in core-mantle boundary heat flow can be detected in paleomagnetic records of geomagnetic field behavior. Their signature is commonly sought in globally distributed
Monika Korte +3 more
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Fractal Properties of the Magnetic Polarity Scale in the Stochastic Hereditary αω-Dynamo Model
Fractal and Fractional, 2022 We study some fractal properties of the hereditary αω-dynamo model in the two-mode approximation. The phase variables of the model describe the temporal dynamics of the toroidal and poloidal components of the magnetic field.
Gleb Vodinchar , Lyubov Feshchenko
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Dynamic mode decomposition of the geomagnetic field over the last two decades
Earth and Planetary Physics, 2023 Earth's magnetic field, which is generated in the liquid outer core through the dynamo action, undergoes changes on timescales of a few years to several million years, yet the underlying mechanisms responsible for the field variations remain to be ...
JuYuan Xu, YuFeng Lin
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BASIC SYSTEMS FOR THE GEOMAGNETIC FIELD [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2010 The system of own solenoidal fields of operator Laplace which can be used for decomposition of a geomagnetic field in a kernel of the Earth is described.
Vodinchar G.M., Kruteva L.K.
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