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Physics of the Earth and Planetary Interiors, 1986
Scientists have been measuring the Earth’s magnetic field for several centuries. They have built up an increasingly more detailed worldwide picture of the field and its variation with time. Field measurements are now made from ships, aeroplanes and satellites as well as on the ground. For older records of the geomagnetic field and its changes with time
Roy Thompson, Frank Oldfield
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Scientists have been measuring the Earth’s magnetic field for several centuries. They have built up an increasingly more detailed worldwide picture of the field and its variation with time. Field measurements are now made from ships, aeroplanes and satellites as well as on the ground. For older records of the geomagnetic field and its changes with time
Roy Thompson, Frank Oldfield
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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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Sources of heading errors in optically pumped magnetometers operated in the Earth's magnetic field
Physical Review A, 2018When optically pumped magnetometers are aimed for use in the Earth's magnetic field, the orientation of the sensor to the field direction is of special importance to achieve accurate measurement results. Measurement errors and inaccuracies related to the
G. Oelsner +4 more
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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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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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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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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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Measuring the Earth’s magnetic field in a laboratory
Physics Education, 2008Two methods for measuring the Earth's magnetic field are described. In the former, according to Gauss, the Earth's magnetic field is compared with that of a permanent magnet; in the latter, a well-known method, the comparison is made with the magnetic field generated by a current.
CARTACCI, ANNA MARIA, STRAULINO, SAMUELE
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