Hale's sunspot observations, 1908

Hale's sunspot observations, 1908

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Hale's sunspot observations. This observation of the Sun, carried out on 7 October 1908 by US astronomer George Ellery Hale (1868-1938), led to the discovery of the magnetic nature of sunspots. The image shows sunspots and hydrogen flocculi and vortices. The results were presented by Hale in a talk titled 'Solar Vortices and Magnetic Fields', given on 14 May 1909 at the Royal Institution in London. The observation was timed at 07:02 PST, and was made at Mount Wilson Observatory, California, USA. This research eventually increased understanding of solar activity and the nature of the solar cycle of this activity.Restrictions:

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