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• W1979009863 abstract "The secular variations of the Earth's field call for frequent determinations of the geomagnetic elements at many selected stations on land and at sea. So far, general world magnetic surveys have of necessity been restricted to the surface of the Earth. Previous surveys, including those of the Department of Terrestrial Magnetism of the Carnegie Institution of Washington, have led to great improvement in our knowledge of the distribution of the field, especially during the past few decades. During the war, much attention has been devoted to the study and analysis of data well distributed over the Earth's entire surface at more than 10,000 stations. These have resulted, for the first time, in the preparation of accurate isoporic charts, that is, charts of equal annual rate of change for magnetic declination, inclination, and the horizontal, vertical, eastward, northward and total components of the field for the four epochs of 1912.5, 1922.5, 1932.5, and 1942.5. The motions of the maximum and minimum isoporic foci during these four epochs indicate the complexity of the secular changes and interpretations. Isomagnetic charts based upon surface observations must always be limited, so far as faithful depiction of the field is concerned, because of the impracticability of obtaining observations at an infinite number of stations and of deductions for both the regular and irregular changes in the field. Progress in instrumentation during the war on the applications of the geomagnetic field of the Earth have produced improvements which make feasible the early realization of magnetic surveys by airplanes at several different levels proposed by Professor Sydney Chapman in the first Charles Chree Address. Some of the potentialities, possibilities, and needs for intense national and international coordination in magnetic surveys by plane are reviewed." @default.
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• W1979009863 date "1946-05-01" @default.
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• W1979009863 title "Geomagnetic secular variations and surveys" @default.
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• W1979009863 doi "https://doi.org/10.1088/0959-5309/58/3/301" @default.
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