Results 91 to 100 of about 1,787 (204)
Magnetization and age of ca. 544 Ma syenite, eastern Canada: Evidence for renewal of the geodynamo [PDF]
The ca. 565 Ma Ediacaran geodynamo was highly unusual, producing an ultralow field 10 times weaker than present-day value of 8 x 1022 A m2. A ∼5 times rise in field strength is seen in time-averaged single crystal paleointensity data of ca.
Nimmo, Francis +10 more
core +1 more source
Mode analysis of numerical geodynamo models
, 2011 International audienceIt 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. We here validate this method by analysing a numerical
Schmitt, D. +5 more
core +1 more source
A Study of Stochastic Resonance in the Periodically Forced Rikitake Dynamo
Terrestrial, Atmospheric and Oceanic Sciences, 2007 The geodynamo has widely been thought to be an intuitive and selfsustained model of the Earth¡¦s magnetic field. In this paper, we elucidate how a periodic signal could be embedded in the geomagnetic filed via the mechanism of stochastic resonance in a ...
Chien-Chih Chen Chih-Yuan Tseng
doaj +1 more source
An alternate representation of the geomagnetic core field obtained using machine learning
Earth, Planets and SpaceMachine learning (ML) as a tool is rapidly emerging in various branches of contemporary geophysical research. To date, however, rarely has it been applied specifically for the study of Earth’s internal magnetic field and the geodynamo. Prevailing methods
Lukács Kuslits +8 more
doaj +1 more source
More stable yet bimodal geodynamo during the Cretaceous superchron?
Geophysical Research Letters, 2016 We report palaeomagnetic and 40Ar/39Ar dating results from two sequences of basaltic lava flows deposited at the same locality in western China, yet separated in time by ~50 Myr: one set lies within the Cretaceous normal superchron at 112–115 Ma and a ...
Florian Lhuillier +8 more
doaj +1 more source
Experimental Constraints on an MgO Exsolution‐Driven Geodynamo
, 2019 MgO exsolution has been proposed to drive an early geodynamo. Experimental studies, however, have drawn different conclusions regarding the applicability of MgO exsolution. While many studies suggest that significant Mg can dissolve into the Earth's core,
Du, Zhixue +7 more
core +1 more source
High thermal conductivity of the Earth's core and geodynamo
Vestnik MGTUThe geomagnetic field is generated by dynamo processes in the Earth's core. This process is supported by the cooling of the planet and the growth of the solid core. It is known that the magnetic field existed long before the appearance of the solid core,
Reshetnyak M. Yu.
doaj +1 more source
Experimental dynamos: from models to applications to the geodynamo
Comptes Rendus. PhysiqueLarmor proposed in 1919 an explanation for the origin of the Sun’s magnetic field. This phenomenon, known as the dynamo effect, is considered to be responsible for most of the magnetic fields of astrophysical objects, including that of the Earth. It took
Pétrélis, François
doaj +1 more source
Rikitake's geodynamo model analysed in terms of classical time series statistics
, 1995 Rikitake's geodynamo model is used to generate synthetic series of geomagnetic reversals which are statistically compared with the real series of reversals.
Marzocchi, W., Mulargia, F., Gonzato, G.
core +1 more source
Modeling Geomagnetic Field Reversals with Coupled Particles in a Double-Well Potential
Albanian Journal of Natural and Technical SciencesWe study a minimal model of geomagnetic field reversals, inspired by Molina-Cardin et al. (2021), in which two particles evolve in a double-well potential and interact through elastic coupling.
Klaudio Peqini
doaj +1 more source