. The Astrophysical journal. Johnspaper, St. John finds a motion outwardfrom the axis of the whirl. This ex-cludes cases Nos. 2 and 3, and thusonly cases Nos. 5 and 8 remain as cor-responding to observed facts. In bothcases £ is negative, that is to say, wecome to the same conclusion as Profes-sor Hale: The Zeeman effect is due to a whirl of negatively chargedelectric particles. This whirl, however, is distinct from the observed hydrogenwhirl, and is situated in a much lower level of the suns atmosphere. Ml. Wilson Contr., Xo. 69; Astrophysical Journal, 37, 322, 1913.^ Mt. Wilson Contr., No. 3
. The Astrophysical journal. Johnspaper, St. John finds a motion outwardfrom the axis of the whirl. This ex-cludes cases Nos. 2 and 3, and thusonly cases Nos. 5 and 8 remain as cor-responding to observed facts. In bothcases £ is negative, that is to say, wecome to the same conclusion as Profes-sor Hale: The Zeeman effect is due to a whirl of negatively chargedelectric particles. This whirl, however, is distinct from the observed hydrogenwhirl, and is situated in a much lower level of the suns atmosphere. Ml. Wilson Contr., Xo. 69; Astrophysical Journal, 37, 322, 1913.^ Mt. Wilson Contr., No. 30; Astrophysical Journal, 28, 315, 1908.^Op. cit. ^ Mt. Wilson Contr., No. 69; Astrophysical Journal, 37, 322, 1913. Clockwise Counter-clockwiseFig. 9 3^4 CARL STORMER The sign of electricity in the whirl being determined, we haveto choose the probable value of the angle co, which determines theform of the current-lines. This can be done by comparing Fig. lowith a series of photographs of hydrogen flocculi whirls taken at. Fig. io Mount Wilson. It will thus be seen that values of co lying between15° and 25, or between -15° and - 25°, agree well with the reality;the dotted lines must then be identified with the hydrogen current-lines and projection of lines of magnetic force (hydrogen RESEARCHES ON SOLAR VORTICES 365 flocculi) for the values co= 20° and co= — 20 are shown on a largerscale in Fig. 11. This agrees well with the strong magnetic effectshown by solar vortices where the structure of the hydrogen flocculiis nearly radial; for the more nearly radial this structure is, themore nearly circular are the current-hnes of the whirl. In order to get some idea regarding the amount of electricityin motion in the whirl, more quantitative calculations are necessary. 0,^-20 ,-ZO
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