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The 150Foot Tower Telescope
Interpretation of Sunspot Spectra
3 other sections not shown
00 OO OO 60-foot tower telescope 75-foot spectrograph angle ap ap ap axis bipolar groups calcium flocculi ccelostat CN CN CN CN CO f CN H compound quarter-wave plate Contr CQ.CQ cycle Ellerman field strength figure following member following spots ft ft ft ftft Greenwich Group H CN Hale half-wave plate heliostat hemisphere Kenwood latitude line of sight lines of force M M M M M M magnetic fields magnetic polarity member is Gr mirrors Mount Wilson Observatory n-components Nicol prism OO 00 OO OO OO 00 OO OO OO OOOOO opposite polarity penumbra phenomena photographic plane position preceding member preceding spot rotated slit small spots Snow telescope solar image spectroheliograph spectroscopic spectrum spot spectra spot-groups spots of opposite umbra unipolar Wilson Group X X X X X Yerkes Observatory Zeeman effect Zeeman triplet