spectroheliographs

spectroheliograph

[spek-troh-hee-lee-uh-graf, -grahf]
noun
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.

Origin:
1890–95; spectro- + heliograph

spectroheliographic [spek-troh-hee-lee-uh-graf-ik] , adjective
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World English Dictionary
spectroheliograph (ˌspɛktrəʊˈhiːlɪəˌɡrɑːf, -ˌɡræf)
 
n
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
 
[C19: from spectro- + helio- + -graph]
 
spectrohelio'graphic
 
adj

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