Abstract
THE spectrohelioscope of Dr. G. E. Hale1 allows one to observe in the light of a single spectral line the extremely rapid variations occurring on the sun's surface. But this spectral line has to belong to the visible region of the solar spectrum. (H especially is used.) The spectroheliograph on the other hand allows one to photograph solar phenomena in the light of any photographically active spectral line, but it is not able to record the very rapid changes.
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References
G. E. Hale, Astrophys. J., 70, 265, 1929; 71, 73, 1930; 73, 379, 1931; 74, 214, 1931.
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ROSENTHAL, A. A New Spectrohelioscope and Spectroheliograph. Nature 132, 350–351 (1933). https://doi.org/10.1038/132350b0
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DOI: https://doi.org/10.1038/132350b0
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