Spectroheliograph



[spek-troh-hee-lee-uh-graf, -grahf] /ˌspɛk troʊˈhi li əˌgræf, -ˌgrɑf/
noun
1.
an apparatus for making photographs of the sun with a monochromatic light to show the details of the sun’s surface and surroundings as they would appear if the sun emitted only that light.
spectroheliograph
/ˌspɛktrəʊˈhiːlɪəˌɡrɑːf; -ˌɡræf/
noun
1.
an instrument used to obtain an image of the sun in light of a particular wavelength, such as calcium or hydrogen, to show the distribution of the element over the surface and in the solar atmosphere. The image obtained is a spectroheliogram

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