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George Ellery Hale (June 29, 1868 – February 21, 1938) was an American astrophysicist, best known for his discovery of magnetic fields in sunspots, and as the leader or key figure in the planning or construction of several world-leading telescopes; namely, the 40-inch refracting telescope at Yerkes Observatory, 60-inch Hale ...
George Ellery Hale (Chicago, 29 giugno 1868 – 21 febbraio 1938) è stato un astronomo e ottico statunitense. Nel 1889 inventò lo spettroeliografo (uno strumento per l'osservazione del Sole in luce monocromatica) e scoprì nel 1908 i campi magnetici nelle macchie solari .
George Ellery Hale (born June 29, 1868, Chicago, Ill., U.S.—died Feb. 21, 1938, Pasadena, Calif.) was an American astronomer known for his development of important astronomical instruments, including the Hale Telescope, a 200-inch (508-cm) reflector at the Palomar Observatory, near San Diego.
Hale's most acclaimed scientific work was his demonstration that sunspots have strong magnetic fields. Hale's Polarity Law shows evidence of the existence of a well-organized large-scale magnetic field in the solar interior that cyclically changes polarity on average every 11 years.
George Ellery Hale using the spectrograph in the 60 foot solar telescope, where, in 1908, he discovered magnetic fields on the Sun, the key to understanding sunspots and solar weather. The 60-inch saw first light in December 1908, but Hale was already pursuing bigger goals.
George Ellery Hale. 1916. Date of Birth. : June 29, 1868. Date of Death. : February 21, 1938. George Hale began studying the solar spectrum as a wealthy teenager in Chicago. As an undergraduate at the Massachusetts Institute of Technology he invented the spectroheliograph.
Hale, George Ellery nell'Enciclopedia Treccani - Treccani - Treccani. Astronomo statunitense (Chicago 1868 - Pasadena 1938), direttore dell' osservatorio Kenwood (1890-96), poi (1896-1905) dell'osservatorio Yerkes (Chicago); fondatore e direttore dell'osservatorio di Mount Wilson in California (1904-23); socio straniero dei Lincei (1911).
