Smithsonian Report, 1942. — Fleming 



PLATE 18 



Photographs of the Aurora Borealis Which accompanied the Geomag- 

 netic STORM OF September 18. 1941. 



(Al! tinios are mean 75° west meridian.) 

 (.1; 201'lOn', with camera pointed overhead, Patchoque, N. Y.; gorgeous corona, a feature of the display 

 unusual so far south, and auroral light filled southern half of the sky, while the north was ouite dark; 

 note Altair in lower center and Delphinus in left center. (Photograph by E. Dayton Thorne.) (B) 

 Caldwell, X. J.; camera pointed about 5°-W south-southeast of zenith toward coronal center; exposure 

 .i seconds, f/3.5. (Photograph by R. AV. Olsen.) (C) Caldwell, X. J.; same as (B); exposure 10 seconds. 

 f/3.5. (Photosraph bv R. W. Olsen.) (X») Caldwell, X. J.; same as (C); exposure 10 seconds, f/3.5. 

 (Photograph by R. W. Olsen.) (E) Caldwell, X. J.: same as (D); exposure 10 seconds, f/3.5. (Photo- 

 graph by R. w! Olsen.) (F) Saranac Inn, X. Y.; cuitain toward northwest; color of mam body was green 

 with edges red, gold, and purple; exposure about 4-0 seconds. (Photograjih by p:rnest T. Pearson.) 



