spectroheliogram

noun
spec·tro·he·lio·gram | \ˌspek-trō-ˈhē-lē-ə-ˌgram \

Definition of spectroheliogram 

: a photograph of the sun that is made by monochromatic light and shows the sun's faculae and prominences

First Known Use of spectroheliogram

1905, in the meaning defined above

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The first known use of spectroheliogram was in 1905

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