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Spectroheliograph


 

The spectroheliograph is an instrument used in astronomy. It captures a photographic image of the Sun at a single wavelength of light, a monochromatic image. The wavelength is usually chosen to coincide with a spectral wavelength of one of the chemical elements present in the Sun.

Related Topics:
Astronomy - Photographic - Sun - Wavelength - Light - Monochromatic - Spectral - Chemical element

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It was developed independently by George Ellery Hale and Henri-Alexandre Deslandres in 1890 and further refined in 1932 by Robert R. McMath to take motion pictures.

Related Topics:
George Ellery Hale - Henri-Alexandre Deslandres - 1890 - 1932 - Robert R. McMath - Motion picture

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The instrument comprises a prism or diffraction grating, together with a narrow slit that passes a single wavelength (a monochromator). The light is focused onto a photographic medium and the slit is moved across the disk of the Sun to form a complete image.

Related Topics:
Prism - Diffraction grating - Monochromator - Focus

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