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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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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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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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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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Measuring Earth’s magnetic field simply
The Physics Teacher, 2000We describe a simple experiment that allows students to measure, within a factor of two, one of the fundamental quantities of the natural world using inexpensive, familiar materials. Students recruited to physics in the class cite this type of experience as the reason.
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