Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 444
ies are determined both from their motion perpen-dicular to the line of sight when they are seen on the sunslimb, and also from spectral line displacements in accord- CH. XI, 236] THE SUN 397 ance with the Doppler-Fizeau principle, and it seems very-improbable that they are not real. The spectra of… … Fig. 150. — Changes in a solar prominence in an interval of ten minutes.Photographed by Slocum at the Yerkes Observatory. generally found. In the higher levfels calcium is the pre-dominating element, a remarkable fact in view of its atomicweight of 40. Prominences were formerly observed only when…
Astronomy
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