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Solar observations, early 1900s

Solar observations, early 1900s

C021/6061

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Credit

YERKES OBSERVATORY, UNIVERSITY OF CHICAGO, COURTESY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY YERKES OBSERVATORY, UNIVERSITY OF CHICAGO, COURTESY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY

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Editorial use only.

Caption

Solar observations. Spectroheliograph image of bright areas (flocculi) observed by US astronomer George Ellery Hale (1868-1938) at the Yerkes Observatory, Williams Bay, Wisconsin, USA. These are calcium flocculi, observed at the spectral wavelengths associated with the element calcium. Observations such as these were used by Hale to determine the rotation period of the Sun. He used the Rumford spectroheliograph, completed in 1899. Hale had invented the first successful spectroheliograph in 1892. The calcium flocculi are the luminous clouds above the sun's disc, with solar prominences (loop-like eruptions) also visible.

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