RADIO FIELD STRENGTHS BY PROFILE TYPES 



249 



Elevated layers below the crossover height were classified as ground- 

 based superrefractive layers. Elevated layers below the crossover height 

 at one weather station and above that height at the other were classified 

 as tilted elevated layers. 



After these characteristic profiles were isolated, the median field 

 strengths for the 3-hourly periods centered upon the radiosonde observa- 

 tion time were arranged into cumulative probability distributions for 

 each profile type. The results are shown in figure 6.13. (There were 

 relatively few examples of subrefractive profiles and no distributions for 

 this category are given.) 



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Figure 6.12. Location of radio path and radiosonde stations used in this study. 



