Results 171 to 180 of about 5,706 (219)

The study of Earth's magnetism (1269–1950): A foundation by Peregrinus and subsequent development of geomagnetism and paleomagnetism

Reviews of Geophysics, 2007
International audienceThis paper summarizes the histories of geomagnetism and paleomagnetism (1269–1950). The role of Peregrinus is emphasized. In the sixteenth century a debate on local versus global departures of the field from that of an axial dipole ...
Vincent Courtillot, Jean-Louis Le Mouël   +1 more
exaly   +2 more sources

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Geomagnetic Survey

2020
Geomagnetic prospecting consists of studying the local deformation of the Earth’s magnetic field produced by differences in the properties of surrounding materials. As fire heats the ground, which transforms the magnetic behaviour of the materials, it leaves an indelible magnetic imprint, the presence of which is revealed by a local deformation of the ...
openaire   +2 more sources

The origin of geomagnetic jerks

Nature, 2002
Geomagnetic jerks, which in the second half of the twentieth century occurred in 1969 (refs 1, 2), 1978 (refs 3, 4), 1991 (ref. 5) and 1999 (ref. 6), are abrupt changes in the second time-derivative (secular acceleration) of the Earth's magnetic field.
Jeremy, Bloxham, Stephen, Zatman, Mathieu, Dumberry   +2 more
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Geomagnetic induction: the study of geomagnetic induction physics

Exploration Geophysics, 1986
Fluctuating electric currents, flowing external to the earth in the ionosphere, the magnetosphere, and beyond, act as primary source fields which cause electromagnetic induction in the solid earth. Secondary electric currents (or 'eddy currents') are thus induced to flow in the earth's oceans, crust, and upper mantle.
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Geomagnetism

Physics of the Earth and Planetary Interiors, 1989
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EDMOND HALLEY AND GEOMAGNETISM*

Nature, 1943
This annual lecture, commemorating Edmond Halley, a great son of Oxford, is devoted to astronomy and terrestrial magnetism. My subject to‐day is Halley's geomagnetic work considered in its historical setting, but I will preface this by a few remarks on Halley as poet—a seldom remembered aspect of his remarkable versatility.Halley's Latin ...
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Geomagnetism

2012
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Geomagnetism

Tectonophysics, 1990
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Geomagnetism

Journal of the Franklin Institute, 1941
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Geomagnetism

2019
Boon, Annique Van Der, Groot, Lennart V De   +1 more
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