Kippax, John Robert, 1849- [from old catalog] · New York and London, G. P. Putnam's sons · leaf 352
ases from the upper solar atmosphere, which areejected from the spot at lower levels. The gasespresent in the nucleus of a sun-spot have a consider-ably lower temperature than on the surface of the Sunoutside of the spot, owing, it is thought, to their coolingby expansion in the axis of the vortex.… … Yerkes Observatory Plate XXI. The Great Sun-Spot of July 17, 1905 The Sun 289 respect to the brilliant envelope of the Sun—the photo-sphere—as it is actually more brilliant than the electricarc. Frequently a spot will be seen to be crossed byone or more brightly shining plume-like projectionscalled…
Stars · Constellations · Planets
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