RADIO TRANSMISSION AND SOLAR PHENOMENA 161 



than in this region. The one-day interval from the center is inter- 

 preted as the time taken for the propagation of the disturbance from 

 the sun to the earth. 



Probably one reason for the indecisive nature of the results is to 

 be found in the intermittent manner in which the solar data are 

 necessarily obtained. It seems likely that considerably more success 

 might be obtained in determining the solar-terrestrial relationships, 

 if the solar disc could be watched continually on a world-wide program 

 of observation, as Hale^ has suggested, to record all solar outbursts 

 and so to increase the completeness of the solar data until they ap- 

 proach those of the terrestrial. 



*Astrophys. Jour., 73, 408, 1931. 



