Journal ArticleDOI
Geomagnetic polarity reversals in a turbulent core
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TLDR
In this paper, the behavior of the main magnetic field components during a polarity transition is investigated using the α 2 -dynamo model for magnetic field generation in a turbulent core.About:
This article is published in Physics of the Earth and Planetary Interiors.The article was published on 1983-12-01. It has received 42 citations till now. The article focuses on the topics: Dynamo theory & Polarity (physics).read more
Citations
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Journal ArticleDOI
Geomagnetic polarity transitions
Ronald T. Merrill,P. L. McFadden +1 more
TL;DR: The most recent geomagnetic polarity transition occurred at about 780 ka, so we have never observed a transition directly as discussed by the authors, but we have been able to obtain a reliable model for even the first few harmonic terms during a transition.
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Records of geomagnetic reversals from volcanic islands of French Polynesia : 2. Paleomagnetic study of a flow sequence (1.2-0.6 Ma) from the island of Tahiti and discussion of reversal models
TL;DR: A volcanic sequence almost 700 meters thick has been sampled in the Punaruu valley on the island of Tahiti, southern central Pacific Ocean as discussed by the authors, and detailed paleomagnetic results have been obtained from 123 sites.
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Longitudinal confinement of geomagnetic reversal paths as a possible sedimentary artefact
TL;DR: In this article, the authors show that longitudinal confinement of virtual geomagnetic poles can arise from the smoothing of non-antipodal stable directions (just) before and after a geOMagnetic reversal, because of the filtering effect of the remanence acquisition process in sediments.
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Geodynamo energy source constraints from palaeomagnetic data
P. L. McFadden,Ronald T. Merrill +1 more
TL;DR: In this paper, it was shown that long-term variation in reversal rate does not occur as a result of change in any inherent inhibition or encouragement in the reversal process, instead, there must be some physical process that actually triggers reversals, and this process must derive from an energy source effectively independent of the energy source powering the main geomagnetic field.
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Secular variation and the origin of geomagnetic field reversals
R. T. Merrill,P. L. McFadden +1 more
TL;DR: In this paper, the authors show that the present evidence favors a mechanism of internal origin for at least the vast majority of geomagnetic reversals, and suggest a reversal model in which reversals are initiated when the quadrupole family couples critically with the dipole family.
References
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Book
The theory of homogeneous turbulence
TL;DR: In this article, the kinematics of the field of homogeneous turbulence and the universal equilibrium theory of decay of the energy-containing eddies are discussed. But the authors focus on the dynamics of decay and not on the probability distribution of u(x).
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Cosmical magnetic fields
TL;DR: Magnetic Field Generation in Electrically-Conducting Fluids by H. K. Moffatt as mentioned in this paper is a seminal work in the field of magnetic field generation in electrically conducting fluids.
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Geomagnetic Reversals: Although decreasing rapidly, the earth's magnetic field is probably not now reversing.
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A Model of the Geodynamo
TL;DR: In this paper, the problem of the generation of the geomagnetic field by convection in the Earth's core is considered and the complete hydromagnetic problem including the Lorentz force is solved in the case of a cylindrical configuration.