Smithsonian Report, 1942. — Fleming 



PLATE 8 







13^ is' 



13^30'" 



13'' IS'' 



"5 



^1 100 



^ % 300 



. 1: ZOO 



^$ 100 

 ■^ 



/eoo 



^ 



,-^ 



r, 



l^ U=^ l 



O.SI6 I ^ 2 



BAND CHANGE 



u 



^M 



4 5 6 7 6 9 10 II IB 13 14 IS 16 



SCALE OF WAVH-FPEOUENCY IN MC/SEC 



Typical Example of Multifrequency Summer-Time Record of Reflections 

 From Ionospheric Regions. 13hi5™ — iShSOm, 120° East Meridian mean 

 Time, November 20. 1939. Watheroo Magnetic Observatory. Western 

 Australia, 



