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- W3005476750 abstract "1. One of the foremost magneticians of the last century, after a lifelong and devoted study of the various phenomena of the “Earth magnetical,” said in a public address: “Viewed in itself and its various relations, the magnetism of the Earth cannot be counted less than one of the most important branches of the physical history of the planet we inhabit.” I shall endeavor to show briefly, in the paper which I have the honor to present before you, the role certain terrestrial-magnetic phenomena may play in the study of the physical characteristics of our atmosphere, especially of those upper levels, 100 kilometers and more above us, to which man has not yet succeeded in sending his exploratory instruments.2. Among the most striking of the Earth's magnetic phenomena is the diurnal variation which takes place chiefly during the daylight hours, and varies in its magnitude and general characteristics with geographic position with the season of the year, and with Sun-spot activity. A preliminary mathematical analysis, made by Schuster and presented before the Royal Society of England in 1889, led to the conclusion that “the principal part of the diurnal variation is due to causes outside of the Earth's surface, and probably to electric currents in our atmosphere.” Furthermore, Schuster found “that the horizontal movements in the atmosphere which must accompany a tidal action of the Sun or Moon or any periodic variation of the barometer, such as is actually observed, would produce electric currents in the atmosphere having magnetic effects similar in character to the observed diurnal variation.” In brief, the hypothesis adopted by Schuster to account for the supposed electric currents, generated in the upper atmospheric regions, was the one first proposed by Balfour Stewart—that the necessary electromotive forces for the production and maintenance of the required electric currents are generated by the motion of masses of conducting air across the lines of the Earth's permanent magnetic field, chiefly of the vertical component, thus bringing into play Foucault currents." @default.
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- W3005476750 date "1918-01-01" @default.
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- W3005476750 title "Solar radiation and terrestrial magnetism" @default.
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