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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Indicators of mantle control on the geodynamo from observations and simulations [PDF]
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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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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Direct and inverse cascades in the geodynamo [PDF]
Nonlinear Processes in Geophysics, 2008 The rapid rotation of planets causes cyclonic thermal turbulence in their cores which may generate the large-scale magnetic fields observed outside the planets. We investigate numerically a model based on the geodynamo equations in simplified geometry,
M. Reshetnyak, P. Hejda
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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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Large‐Scale Atomistic Simulations of Magnesium Oxide Exsolution Driven by Machine Learning Potentials: Implications for the Early Geodynamo [PDF]
Geophysical Research LettersThe precipitation of magnesium oxide (MgO) from the Earth's core has been proposed as a potential energy source to power the geodynamo prior to the inner core solidification. Yet, the stable phase and exact amount of MgO exsolution remain elusive.
Jie Deng
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Mode analysis of numerical geodynamo models [PDF]
, 2011 It has been suggested in Hoyng (2009) that dynamo action can be analysed by expansion of the magnetic field into dynamo modes and statistical evaluation of the mode coefficients.
Aubert +37 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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Regular reversals in the six-jet geodynamo model [PDF]
E3S Web of Conferences, 2018 A low-mode geodynamo model is developed, controlled by 6-jet convection in the core of the Earth. The model contains only four modes, representing the fields of temperature, velocity, and two fields of magnetic induction. The magnetic modes was chosen by
Feshchenko Liubov
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Early Cambrian renewal of the geodynamo and the origin of inner core structure. [PDF]
Nat Commun, 2022 Zhou T +11 more
europepmc +3 more sources