Results 131 to 140 of about 452 (183)

Secular variation and acceleration of the geomagnetic field

, 2006
Korte, M. ; https://orcid.org/0000-0003-2970-9075, Wardinski, I.   +1 more
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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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On the geomagnetic secular variation in the Pacific region

Physics of the Earth and Planetary Interiors, 2018
Abstract It is widely believed that in the Pacific region the geomagnetic secular variation is low and that the non-dipole field is weak. This is also known as hemispherical asymmetry between the Pacific and the Atlantic hemispheres, representing the low secular variation in the Pacific hemisphere.
Hisayoshi Shimizu
exaly   +2 more sources

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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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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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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Geomagnetic Core Field Secular Variation Models

Space Science Reviews, 2009
We analyse models describing time changes of the Earth’s core magnetic field (secular variation) covering the historical period (several centuries) and the more recent satellite era (previous decade), and we illustrate how both the information contained in the data and the a priori information (regularisation) affect the result of the ill-posed ...
Gillet, N., Lesur, V., Olsen, N.
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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 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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