Results 141 to 150 of about 471 (192)

Magnetostratigraphic resolution of the late Ediacaran paleomagnetic enigma

Pierce J, Evans D, Polomski D, Youbi N, Mediany M, Ounar J, Oukhro R, Boumehdi MA, Strauss J, Keller CB, Gärtner A, Ovtcharova M, Wotzlaw J, Linnemann U.   +13 more
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Tektites and Geomagnetic Reversals

Nature, 1967
THE microscopic glassy objects which occur in sediments deposited in the Australasian area during and shortly after the last magnetic polarity reversal are apparently tektites (see succeeding communication). The last reversal occurred 0.7 × 106 yr ago: potassium–argon dates1 indicate that the Australasian tektites were formed 0.7 × 106 yr ago.
BILL GLASS, BRUCE C. HEEZEN
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On rates of occurrence of geomagnetic reversals

Physics of the Earth and Planetary Interiors, 2000
Abstract The magnetostratigraphic time scale provides a record of the occurrence of geomagnetic reversals. The temporal distribution of reversals may be modelled as the realization of an inhomogeneous renewal process; i.e., one in which the intensity, λ(t), or reversal rate is a function of time.
Catherine G. Constable
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The periodicity of geomagnetic reversals

Physics of the Earth and Planetary Interiors, 1992
Abstract Several periodicities have been claimed in the time series of geomagnetic reversals, but none has survived subsequent methodological objections. We apply the established tool of periodogram analysis to the most accurate geomagnetic scale available and obtain the following results: a trend, that is well fitted by an exponential curve, is ...
Marzocchi, W., Mulargia, F.
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The physical basis of geomagnetism and geomagnetic reversals

AIP Conference Proceedings, 1976
Geomagnetism is the most familiar example of astrophysical magnetic field production. Our current understanding of the principles of magnetic field generation is briefly reviewed and the major outstanding problems are outlined, with particular emphasis on the Earth.
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Geomagnetic Reversals during the Phanerozoic

Science, 1971
An analysis of worldwide paleomagnetic measurements suggests a periodicity of 350 × 10 6 years in the polarity of the geomagnetic field. During the Mesozoic it is predominantly normal, whereas during the Upper Paleozoic it is predominantly reversed.
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Morphology of geomagnetic reversals

Reviews of Geophysics, 1987
Geophysicists from the United States have been very active in the international effort to understand the nature of the geomagnetic field during polarity reversals. The traditional justification of this research, that knowledge of transitional field behavior may eventually help constrain theoretical geomagnetic dynamo models, remains compelling.
Scott W. Bogue, Kenneth A. Hoffman
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Geomagnetic reversal history

Terra Nova, 1990
ABSTRACTThe history of geomagnetic polarity reversals in the Cenozoic and Late Mesozoic is well known since the Late Jurassic (Oxfordian). A continuous record of polarity has been derived for this time interval from the interpretation of oceanic magnetic anomalies.
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Stochastic Resonance in Geomagnetic Polarity Reversals

Physical Review Letters, 2003
Among noise-induced cooperative phenomena a peculiar relevance is played by stochastic resonance. In this paper we offer evidence that geomagnetic polarity reversals may be due to a stochastic resonance process. In detail, analyzing the distribution function P(tau) of polarity residence times (chrons), we found the evidence of a stochastic ...
Consolini G., De Michelis P.
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Dynamical similarity of geomagnetic field reversals

Nature, 2012
No consensus has been reached so far on the properties of the geomagnetic field during reversals or on the main features that might reveal its dynamics. A main characteristic of the reversing field is a large decrease in the axial dipole and the dominant role of non-dipole components.
Jean-Pierre, Valet, Alexandre, Fournier, Vincent, Courtillot, Emilio, Herrero-Bervera   +3 more
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