Results 261 to 270 of about 17,575 (301)

Accounting for magnetic diffusion in core flow inversions from geomagnetic secular variation

Geophysical Journal International, 2008
International audienceWe use numerical dynamos to investigate the possible role of magnetic diffusion at the top of the core. We find that the contribution of radial magnetic diffusion to the secular variation is correlated with that of tangential ...
Hagay Amit, Amit Hagay, Christensen Ulrich R   +2 more
exaly   +2 more sources

Secular Variation of the Intensity of the Geomagnetic Field in Mexico During the First Millennium BCE

Geochemistry, Geophysics, Geosystems, 2019
International audienceIn Western Eurasia, the first millennium BCE is characterized by the fastest secular variation of the Earth Magnetic Field observed over the last millennia and by a geomagnetic anomaly centered on the Middle East.
Gwenael Hervé, M Perrin, Luis M Alva-Valdivia   +2 more
exaly   +3 more sources

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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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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 Gravity Variations

1993
Detailed analysis of repeated absolute gravity determinations that have been carried out during last 15 years using ballistic gravimeters at stations located in Europe (Potsdam, Sevres), and Northern America (Denver) permits to suspect the existence of global gravity variations with amplitudes of about 30–40 microgal which seem to be correlated with ...
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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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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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secular variation

2014
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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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