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spectroheliograph
spectroheliograph n. 
/ˌspɛktrə(ʊ)ˈhiːlɪəɡraf/,
Brit. /ˌspɛktrə(ʊ)ˈhiːlɪəɡrɑːf/
, /ˌspɛktrə(ʊ)ˈhiːlɪəɡrɑːf//ˌspɛktrə(ʊ)ˈhiːlɪəɡraf/U.S. /ˌspɛktroʊˈhiliəˌɡræf/
(a) an instrument which photographs the sun using light of a particular wavelength, esp. that of the Balmer α emission line of hydrogen; †(b) a spectroheliogram./ˌspɛktroʊˈhiliəˌɡræf/ΘΚΠ
the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > sun
helioscope1675
heliostat1747
photoheliograph1862
photohelioscope1864
coronagraph1885
spectroheliograph1892
spectrohelioscope1906
spectroheliometer1973
the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > sun > photograph
spectroheliograph1892
spectroheliogram1905
1892 Athenæum 16 July 102/1 An instrument called the spectroheliograph.., by means of which..photographs are now made of all the prominences visible round the entire circumference of the sun with a single exposure.
1903 G. E. Hale in Publ. Yerkes Observ. III. i. 5 I now propose the name flocculi for the regions on the Sun's disk which are shown only on photographs made with the spectroheliograph.
1907 Athenæum 6 Apr. 415/3 Dr. Lockyer showed spectroheliographs of the sun.
1915 G. E. Hale Ten Years Wk. Mount. Observ. 20 The spectroheliograph..discloses extensive clouds of calcium, hydrogen, iron, and other vapors, which..are recorded (as flocculi).
1965 P. Wylie They both were Naked iv. 152 Big gadgets—telescopes, spectroheliographs, particle accelerators and the like.
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