The Collaborative International Dictionary
Spectroheliogram
Spectroheliogram \Spec`tro*he"li*o*gram`\, n. [Spectrum + heloi- + -gram.] (Astrophysics) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's facul[ae] and prominences.
Wiktionary
spectroheliogram
n. (context astronomy English) a photograph taken using a spectroheliograph