Results 221 to 230 of about 14,851 (262)

The analysis of the geomagnetic secular variation

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1951
Abstract After some discussion of the general properties of the secular variation field, a graphical method is described of analyzing it in terms of separate dipoles of arbitrary direction. The analysis shows that the major part of the field for epoch 1922.5 is explained by about twelve vertical dipoles below the surface of the core ...
F. J. Lowes, S. J. Runcorn
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Secular variation magnetostratigraphy

1986
This chapter concentrates on secular variation magnetostratigraphic dating applications within the past 10 000 years. It describes collection and measurement techniques which have been found useful in investigating lake sediments and presents type palaeomagnetic secular variation records of both declination and inclination, from seven regions of the ...
Roy Thompson, Frank Oldfield
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On the analysis of paleomagnetic secular variation

Journal of Geophysical Research: Solid Earth, 1995
Modern methods of geomagnetic field analysis can be applied to paleomagnetic data provided account is taken of the relatively sparse and inaccurate nature of paleomagnetic results. Paleomagnetism tends to produce data sets dominated by inclination measurements, which do not provide a unique field model. As an example, two magnetic fields are found with
David Gubbins, Peter Kelly
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Dynamics of the secular variation

Physics of the Earth and Planetary Interiors, 1991
Abstract There have been many calculations of core motions from secular variation data using the induction equation in the frozen-flux approximation. The induction equation does not allow unique flows to be determined and additional constraints are required.
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Secular Variation in Scandinavia

Nature Physical Science, 1971
This article discusses the considerable differences between the variations of the geomagnetic field given by the International Geomagnetic Reference Field at locations in Scandinavia and the variations derived from data obtained at Scandinavian observatories. The reasons for the discrepancies remain obscure.
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Geomagnetic secular variation impulses

Nature, 1984
The secular variation of the Earth's internal magnetic field changes on time scales of the order of a year. Such impulses occurred in 1969 and probably in 1913; they provide constraints on deep mantle conductivity, which appears to be rather low, and on the motions of the top of the fluid core, which are probably dominated by westward drift.
V. Courtillot, J. L. Le Mouël
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III. On a secular variation in the rainfall in connexion with the secular variation in amount of sun-spots

Proceedings of the Royal Society of London, 1876
Abstract In this paper the author sums up the principal results obtained by his Investigations as follows:— (1.) Taking for the individual years of maximum and minimum sunspot those given in par. 4, it is found that the rainfall in the maxima exceeds the rainfall in the minima years in each country or district, and therefore in all ...
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Correlation of and secular variations

Geochimica et Cosmochimica Acta, 1980
Ján Veizer, William T Holser, Cheryl K Wilgus   +2 more
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secular variation

2014
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The Secular Variation of Climate

Geographical Review, 1921
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