Spectroheliogram
From BiblePortal Wikipedia
Spectroheliogram [1]
(n.) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's faculae and prominences.
Spectroheliogram [1]
(n.) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's faculae and prominences.