Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 448
00,000 or 300,000 miles, while someof the streamers reach out at least 5,000,000 miles. So farit has not been possible to find any observational evidenceof the corona except at the times of total eclipses of the sun.One of the reasons that eclipses are of great scientific in-terest is that they… … Fig. 153. — Spectroheliograms of a sun spot with the doubly reversed H-lineof calcium. Hale and EUerman, Solar Observatory, Aug. 7 and 9, 1915. arranged in concentric layers like an atmosphere, but ismade up of comphcated systems of streamers (Fig. 154), ingeneral stretching out radially from the…
Astronomy
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