spec·tro·he·lio·gram noun \ˌspek-trō-ˈhē-lē-ə-ˌgram\
: a photograph of the sun that is made by monochromatic light and shows the sun's faculae and prominences
First Known Use of SPECTROHELIOGRAM
Seen & Heard
What made you want to look up spectroheliogram? Please tell us where you read or heard it (including the quote, if possible).