Results 231 to 240 of about 52,218 (285)
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Reversals of the earth's magnetic field
Physics Reports, 1971Abstract One of the most intriguing problems in geophysics to-day is why the Earth's magnetic field reverses. This review summarizes the progress in our knowledge of the subject since Bullard's [1] Bakerian Lecture to the Royal Society in 1967. Reversals have played a major role in the changed outlook in geological thinking through the development of
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On the Origin of the Earth's Magnetic Field
Physical Review, 1939The terrestrial field is traced here to the existence of thermoelectric currents in the metallic interior of the earth. The currents owe their existence to inhomogeneities continually created by turbulent convective motions. In order to obtain a nonvanishing resultant angular momentum of the currents around the earth's axis, the current system must ...
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Origin of the Earth's Magnetic Field
Nature, 1939THERE is considerable physical evidence that the earth possesses a metallic core1. Jeffreys2 has estimated the viscosity of the core and finds it as low as 1010 C.G.S. units. If this value is correct, an intense thermal convection must be maintained in the core by the heat development of radioactive impurities, even if the amount of the latter is ...
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Contemporary Physics, 1984
Abstract There is a good observational record of the history of the Earth's magnetic field throughout geological time. The physical processes occurring in the liquid core, where the field originates, are very complex however, and they are only just beginning to be understood.
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Abstract There is a good observational record of the history of the Earth's magnetic field throughout geological time. The physical processes occurring in the liquid core, where the field originates, are very complex however, and they are only just beginning to be understood.
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2014
This chapter deals with the basics of the Earth’s magnetic field. Hydromagnetic dynamo operating in the Earth’s fluid outer core is treated as a main source of the Earth’s magnetic field. Here we discuss the interaction between solar wind and the Earth’s magnetosphere that forms the global magnetospheric configuration as well as the impacts of the ...
Vadim Surkov, Masashi Hayakawa
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This chapter deals with the basics of the Earth’s magnetic field. Hydromagnetic dynamo operating in the Earth’s fluid outer core is treated as a main source of the Earth’s magnetic field. Here we discuss the interaction between solar wind and the Earth’s magnetosphere that forms the global magnetospheric configuration as well as the impacts of the ...
Vadim Surkov, Masashi Hayakawa
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On the magnetic field of the Earth
Terrestrial Magnetism and Atmospheric Electricity, 1911Dr. L. A. Bauer, in his very suggestive paper, “The external electric currents and the Earth's magnetization,”1 has come to the following “working hypothesis:” The Earth is chiefly an electromagnet, the magnetizing currents being outside and consisting of negative electric currents circulating overhead in the same general direction as that of the Earth'
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1970
Geomagnetic micropulsations are short period (usually of the order of seconds or minutes) fluctuations of the Earth’s magnetic field. They are transitory variations of small amplitude (usually less than one part in 104 of the Earth’s main field) and leave no permanent effect on the field. Like longer period disturbances such as magnetic storms they are
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Geomagnetic micropulsations are short period (usually of the order of seconds or minutes) fluctuations of the Earth’s magnetic field. They are transitory variations of small amplitude (usually less than one part in 104 of the Earth’s main field) and leave no permanent effect on the field. Like longer period disturbances such as magnetic storms they are
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Journal of Navigation, 1950
The Institute has now completed two years of its existence. The papers which have been read before it during these two years have covered a wide range of subjects and have served to emphasize the many ramifications of the science of navigation. Because of the high speed of modern aircraft, air navigation presents more problems and of greater variety ...
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The Institute has now completed two years of its existence. The papers which have been read before it during these two years have covered a wide range of subjects and have served to emphasize the many ramifications of the science of navigation. Because of the high speed of modern aircraft, air navigation presents more problems and of greater variety ...
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NMR imaging in the earth's magnetic field
Magnetic Resonance in Medicine, 1990AbstractThe most important and very expensive part of a magnetic resonance imaging set‐up is the magnet, which is capable of generating a constant and highly homogeneous magnetic field. Here a new MR imaging technique without the magnet is introduced. This technique uses the earth's magnetic field instead of a magnetic field created by a magnet.
J, Stepisnik, V, Erzen, M, Kos
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2013
Recent studies of the time averaged field (TAF) shows that the paleofield of Earth is much less variable than the present magnetic field, which is asymmetric between the northern and southern hemispheres. The VGP dispersion in the southern hemisphere is much larger than in the northern hemisphere.
Neil D. Opdyke, Victoria Mejia
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Recent studies of the time averaged field (TAF) shows that the paleofield of Earth is much less variable than the present magnetic field, which is asymmetric between the northern and southern hemispheres. The VGP dispersion in the southern hemisphere is much larger than in the northern hemisphere.
Neil D. Opdyke, Victoria Mejia
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