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How Do Core Surface Flow Models Vary When Inverted from IGRF-14 Candidate Field Models?
Rogers HF, Mandea M.
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Geomagnetic secular variation impulses
Nature, 1984The 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, 1971We 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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Secular variation magnetostratigraphy
1986This 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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2013
The historical record shows that secular variation at Hawaii is limited to a few degrees in the last 400 years, whereas in the Atlantic hemisphere it often exceeds 30°. Paleomagnetic measurements from Hawaii show virtually no change in declination during the last 5 kyr and only a slow, millenium-scale inclination change of less than 20°.
David Gubbins, Steven J. Gibbons
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The historical record shows that secular variation at Hawaii is limited to a few degrees in the last 400 years, whereas in the Atlantic hemisphere it often exceeds 30°. Paleomagnetic measurements from Hawaii show virtually no change in declination during the last 5 kyr and only a slow, millenium-scale inclination change of less than 20°.
David Gubbins, Steven J. Gibbons
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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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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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Secular Variation in Economic Geology
Economic Geology, 2010The temporal pattern of ore deposits on a constantly evolving Earth reflects the complex interplay between the evolving global tectonic regime, episodic mantle plume events, overall changes in global heat flow, atmospheric and oceanic redox states, and even singular impact and glaciation events. Within this framework, a particular ore deposit type will
R. J. Goldfarb, D. Bradley, D. L. Leach
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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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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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