SOLAR RADIATION AND ATMOSPHERE — STETSON 



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mathematical work of Dr. Stormer, in calculating the movements 

 of hypothetical charged particles from the sun striking the upper 

 atmosphere of the earth and thereby producing aurorae, would cer- 

 tainly seem to favor the idea that corpuscular radiation of some sort 

 is responsible for this phenomenon. 



mmi 



Figure 5. — Curve showing correspondence between sunspot activity, terrestrial 

 magnetic changes, clisturl)ances in the F layer and field strengths in the broad- 

 cast band (E layer). All are plotted with respect to days before and after 

 bright aurorae. 



We have recently made a study of our last 10 years of recordings of 

 field strengths from WBBM Chicago as received in the vicinity of 

 Boston for days immediately preceding and following conspicuous 

 auroral displays. Comparisons have also been made of the index of 

 sunspottedness for the same intervals. It was immediately apparent 

 from our statistical analysis that on the average auroral displays 



