A history of the early recording of geomagnetic variations

Physics

Scientific paper

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Scientific paper

As pulsations and circulating currents are caused by solar activity, a short survey is given of how to recognise solar influences on terrestrial magnetism, and particularly the hypotheses of Balfour Stewart and the two treatises of Arthur Schuster about the daily variations. In meteorology and geomagnetism, photographic self-registering equipment was developed in Greenwich and Kew; E. Mascart and M. Eschenhagen continued this line. With the help of his ``Feinregistriergerät'' (quick-run magnetograph) Eschenhagen could for the first time record pulsations more precisely. Through short-time simultaneous observations suggested by him, the course of a terrestrial magnetic disturbance could be pursued. This disturbance was identified by A. Schmidt in 1899 as a moving circulating current in the upper layer of the atmosphere.

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