Results 191 to 200 of about 1,592 (224)

Varying geomagnetic anomalies and secular variation

Journal of Geophysical Research: Solid Earth, 1983
The time variations of the geomagnetic field at 10 European observatories were examined in detail. Fourier analyses were made for three field components at each of the observatories. Curves for each component were synthesized for three passbands: A low passband for periods greater than 30 years, a mid passband for periods equal to or less than 30 years
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Secular trends in daily geomagnetic variations

Journal of Atmospheric and Terrestrial Physics, 1980
Abstract After removal of seasonal and sunspot cycle effects, the solar ( S ) and lunar ( L ) daily geomagnetic variations at Hermanus, Huancayo and San Juan are found to have significant secular changes. The solar variations are shown to be more closely fixed to local magnetic coordinates than to geographic coordinates.
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Secular Variations of the Geomagnetic Field in Europe

2009
Geoinformation Issues, 2009, Vol.
Sas-Uhrynowski, Andrzej, Welker, Elżbieta   +1 more
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Historical Secular Variation and Geomagnetic Theory

1989
The historical record of magnetic observations from AD 1695 has been analyzed to give maps of the magnetic field at the core-mantle boundary for the last 300 yr. These maps have been interpreted qualitatively in terms of a stationary dynamo field with hemispheric symmetry and a pattern of secular variation linked to the base of the solid mantle by ...
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Archaeomagnetic investigations of geomagnetic secular variations

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1982
Abstract Bulgarian archaeomagnetic directions and intensities show a satisfactory agreement with those for Ukraine and Paris. Bauer plots of declination against inclination show both clockwise and anticlockwise looping through the last eight millennia. The necessity for accurate dating of samples studied is stressed.
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The Geomagnetic Secular Variation in the Ross dependency

New Zealand Journal of Geology and Geophysics, 1963
Abstract The first magnetic observations in the Ross Dependency were made by Sir James Clark Ross in 1840. Since then various expeditions have carried out magnetic measurements, but until the beginning of the International Geophysical Year (IGY) the results were scanty.
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Geomagnetic secular variation in the Cretaceous Normal Superchron and in the Jurassic

Physics of the Earth and Planetary Interiors, 2008
Andrew J Biggin, Douwe J J Van Hinsbergen, Cor G Langereis   +2 more
exaly  

Geomagnetic Field, Secular Variation

2011
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Secular Variation of the Geomagnetic Field

1985
Tsuneji Rikitake, Yoshimori Honkura
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Regional Features of the Secular Variation of the Geomagnetic Field in China Area

Chinese Journal of Geophysics, 2005
Wen-Yao Xu
exaly