162 



N CLIMATOLOGY 



300 



280 



260 



240 



220 



200 



180 



160 



< 140 



120 



100 



tTS tao tat IM tn >oo >ae 



ITS tlO tM »0 



Refractive Index in Units of N = (n-l)xlO® 

 Figure 4.54. Vertical distributions of refradivity at Haswell, Colo., for June 21-22, 1962 



Therefore, in answer to part (b) of the problem, for maximum ducting 

 conditions with a 100-m-thick duct: 



92.3 m < loss region < 3 + 100 m, or 



92.3 m < loss region < 103 m. 



