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spectroheliogram
spectroheliogram n.
Brit. 
/ˌspɛktrə(ʊ)ˈhiːlɪəɡram/
, /ˌspɛktrə(ʊ)ˈhiːlɪəɡram/U.S. /ˌspɛktroʊˈhiliəˌɡræm/
a photograph obtained with a spectroheliograph./ˌspɛktroʊˈhiliəˌɡræm/ΘΚΠ
the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > sun > photograph
spectroheliograph1892
spectroheliogram1905
1905 Astrophysical Jrnl. 21 354 Spectroheliograms were obtained showing detail in the centre of the disk.
1924 Glasgow Herald 13 June 5 Solar cyclonic motions have in recent years been clearly demonstrated by spectroheliograms obtained at the Mount Wilson Observatory.
1929 G. E. Hale in Encycl. Brit. XXI. 179/2 The long dark flocculi..shown on hydrogen spectroheliograms.
1932 G. E. Hale Signals from Stars 56 Objects familiar for years on hydrogen spectroheliograms.
1968 New Scientist 11 Jan. 97/1 (caption) X-ray spectro~heliograms of solar plages obtained with OSO-4.
1973 Sci. Amer. Oct. 73/1 The spectroheliograms were made by holding the diffraction grating at one angle, so that only a single wavelength fell on the photomultiplier. The solar image was then scanned in a raster pattern to build up a picture of the sun in that one wavelength.
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