|spek(ˌ)trō+ noun
Etymology: spectro- + heli- + -gram
: a photograph of the sun made by monochromatic light usually of the hydrogen-alpha line in the red or the calcium K line in the violet and showing the sun's faculae and prominences
|spek(ˌ)trō+ noun
Etymology: spectro- + heli- + -gram
: a photograph of the sun made by monochromatic light usually of the hydrogen-alpha line in the red or the calcium K line in the violet and showing the sun's faculae and prominences
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012