Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 215
rrangementand relations ofthe photosphericclouds in theneighborhood ofa spot are such asare represented inFig. 213. Overthe suns surfacegenerally, theseclouds probablyhave the form ofvertical columns,as at a a. Justoutside the spot,the level of thephotosphere isthe most part, overtopped by… … Fig. 213. ASTRONOMY. I95 sun, these spiky, vivid outbursts of metallic vapors seldomoccur except just in the neighborhood of a spot, and then onlyduring its season of rapid change. In the penumbra of thespot the photospheric filaments become more or less nearlyhorizontal, as at pp ; in the umbra at…
Astronomy
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