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Magnetic Helicity and the Geodynamo
Fluids, 2021 We present theoretical and computational results in magnetohydrodynamic turbulence that we feel are essential to understanding the geodynamo. These results are based on a mathematical model that focuses on magnetohydrodynamic (MHD) turbulence, but ...
John V. Shebalin
doaj +1 more source
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.
openaire +1 more source
Can Core Flows inferred from Geomagnetic Field Models explain the Earth's Dynamo? [PDF]
, 2015 We test the ability of large scale velocity fields inferred from geomagnetic secular variation data to produce the global magnetic field of the Earth.Our kinematic dynamo calculations use quasi-geostrophic (QG) flows inverted from geomagnetic field ...
Pais, Maria Alexandra +2 more
core +5 more sources
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
doaj +1 more source
Effects of anisotropy in geostrophic turbulence [PDF]
, 2009 The Boussinesq model of convection in a flat layer with heating from below is considered. We analyze the effects of anisotropy caused by rapid rotation in physical and wave spaces and demonstrate the suppression of energy transfer by rotation.
Alexakis +37 more
core +1 more source
Planetary gyre, time-dependent eddies, torsional waves, and equatorial jets at the Earth's core surface [PDF]
, 2015 We report a calculation of time-dependent quasi-geostrophic core flows for 1940-2010. Inverting recursively for an ensemble of solutions, we evaluate the main source of uncertainties, namely the model errors arising from interactions between unresolved ...
Finlay, C. C., Gillet, N, Jault, D
core +4 more sources
Convection–driven geodynamo models [PDF]
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2000 Summary: There has been significant progress in the development of numerical geodynamo models over the last five years. Advances in computer technology have made it possible to perform three-dimensional simulations, with thermal or compositional convection as the driving mechanism.
openaire +1 more source
Gross thermodynamics of two-component core convection [PDF]
, 2004 We model the inner core by an alloy of iron and 8 per cent sulphur or silicon and the outer core by the same mix with an additional 8 per cent oxygen.
Alfè +31 more
core +1 more source
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
doaj +1 more source
Reversals in nature and the nature of reversals [PDF]
, 2007 The asymmetric shape of reversals of the Earth's magnetic field indicates a possible connection with relaxation oscillations as they were early discussed by van der Pol.
Aubert J +34 more
core +2 more sources