THE EARTE AND SUN AS MAGNETS 



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Fig. 6. Calcium (H 2 ) Flocculi photographed with the Spectroheliogeaph, 



April 30, 1908. 



spectroheliograph, by admitting no light to the sensitive plate except 

 that radiated by calcium vapor. These calcium flocculi (Fig. 6), like 

 the cumulus clouds of the earth's atmosphere, exhibit no well-defined 

 linear structure. But if we photograph the sun with the red light of 

 hydrogen, we find a very different condition of affairs (Fig. 7). In 

 this higher region of the solar atmosphere, first photographed on Mount 

 Wilson in 1908, cyclonic whirls, centering in sun-spots, are clearly 

 shown. 



The idea that sun-spots may be solar tornadoes, which was strongly 





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Fig. 7. Htdrogex (Ho.) Flocculi photographed with the Spectroheliogeaph, 



April 30, 1908. 



