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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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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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Pacific Geomagnetic Secular Variation

Science, 1971
We have considered several different types of records of long-period geomagnetic secular variation: direct measurements made in geomagnetic observatories; paleomagnetic measurements on Hawaiian lava flows with accurately known ages in the interval 0 to 200 years; paleomagentic measurements on Hawaiian lava flows with loosely determined ages within the ...
Richard R. Doell, Allan Cox
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On the unpredictability of geomagnetic secular variation

Physics of the Earth and Planetary Interiors, 1985
Abstract Various methods for the prediction of secular variation are tested by applying them to data for a single element at a single station. None of them is of any use for more than a few years.
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Geomagnetic secular variations and surveys

Proceedings of the Physical Society, 1946
The secular variations of the Earth's field call for frequent determinations of the geomagnetic elements at many selected stations on land and at sea. So far, general world magnetic surveys have of necessity been restricted to the surface of the Earth.
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Geomagnetic Secular Variation in Scandinavia

Nature Physical Science, 1972
IT has been pointed out by E. B. Fabiano of the United States National Oceanic and Atmospheric Administration (private communication) that the values for the secular variation in the declination ( Open image in new window ), quoted in my recent communication1 as having been computed from the International Geomagnetic Reference Field (IGRF), are in ...
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Geomagnetic secular variation in the Indian Ocean

Earth and Planetary Science Letters, 2003
Abstract Annual repeat stations in Australia and in South Africa show that secular variation may change rapidly and over short geographical distances in the Indian Ocean area. Satellite models show large secular variations in the center of the Indian Ocean where there are few island geomagnetic observatories.
J.R. Heirtzler, K. Nazarova
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Geomagnetic Secular Variation

1989
The spatial and temporal variation of the geomagnetic field component annual means has been analyzed. The data used in this study consist of the annual means of the vector magnetic field components measured at nearly one hundred magnetic observatories widely distributed about the Earth.
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Geomagnetic secular variation Model E

Journal of Geophysical Research, 1974
We propose a new geomagnetic secular variation model (model E) in which the correlation coefficient between the main dipole and the nondipole components can lie between 0 and +1. This model then describes the total secular variation as a region bounded by lower and upper limits that can be reduced to a single curve only when more adequate data become ...
Czang-Go Baag, C. E. Helsley
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Pacific geomagnetic secular variation.

Science (New York, N.Y.), 2010
We have considered several different types of records of long-period geomagnetic secular variation: direct measurements made in geomagnetic observatories; paleomagnetic measurements on Hawaiian lava flows with accurately known ages in the interval 0 to 200 years; paleomagentic measurements on Hawaiian lava flows with loosely determined ages within the ...
R R, Doell, A, Cox
openaire   +1 more source