Julius Bartels
Julius Bartels (17 August 1899, Magdeburg – 6 March 1964) was a German geophysicist and statistician who made notable contributions to the physics of the Sun and Moon; to geomagnetism and meteorology; and to the physics of the ionosphere. He also made fundamental contributions to statistical methods for geophysics. Bartels was the first President of the International Association of Geomagnetism and Aeronomy (IAGA). With Sydney Chapman, he wrote the influential book ''Geomagnetism''. Provided by Wikipedia-
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