. Astronomy for high schools and colleges . Fig. 83.—suns corona during the eclipse of july 39, 1878. THE SUNS PROMINENCES. aoa sun. There were others of various and perhaps varyingshapes, and the bases of these were connected by a lowband of serrated rose-colored light. One of these protu-berances was shown to be entirely above the sun, as iffloating within its atmosphere. Around the whole diskof the sun a ring of similar nature to the prominencesexists, which is brighter than the corona, and seems toform a base for the protuberances themselves ; this isthe sierra. Some of the red flames were
. Astronomy for high schools and colleges . Fig. 83.—suns corona during the eclipse of july 39, 1878. THE SUNS PROMINENCES. aoa sun. There were others of various and perhaps varyingshapes, and the bases of these were connected by a lowband of serrated rose-colored light. One of these protu-berances was shown to be entirely above the sun, as iffloating within its atmosphere. Around the whole diskof the sun a ring of similar nature to the prominencesexists, which is brighter than the corona, and seems toform a base for the protuberances themselves ; this isthe sierra. Some of the red flames were of enormousheight; one of at least 80,000 Fig. 84.—forms op the solar prominences as seen with thespectroscope. Gaseous Nature of the Prominences.—The next eclipse(1868, July) was total in India, and was observed by manyskilled astronomers. A discovery of M. Janssens* willmake this eclipse forever memorable. He was providedwith a spectroscope, and by it observed the prominence in particular was of vast size, and whenthe spectroscope was turned upon it, its spectrum was dis-continuous, showing the bright lines of hydrogen gas. * Now Director of the Solar Observatory of Meudon, near Paris. 304 ASTRONOMY. The brightness of the spectrum was so marked thatJanssen determined to keep his spectroscope fixed upon iteven after the reappearance of sunHght, to see how long itcould be followed. It was found that its spectrum couldstill be seen after the return of complete sunlight; and notonly on that day, but on subsequent days, similar phenom-ena could be observed. One great difficulty was conquered in an instant. Th
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