TURBULENCE PARAMETER, II 263 



Noting that 



(6.28) then becomes, upon integration, 



No 



n = Ndz-^ir [exp (-Tdl)-l] 



Jo Ad 



+ ^»exp ^-r^^^) {exp [-r.(3-0]-l}. (6.29) 



1 w 



n is thus dependent upon both A'^ profile characteristics and initial condi- 

 tions. In fact, all the terms on the righthand side of (6.29) save 



3 



Ndz 



are determined from the conditions at the earth's surface. One might ex- 

 pect, then, that 11 would constitute a useful radio-meteorological param- 

 eter since it includes both the time-proven parameter A^o, the concept of 

 atmospheric stability, and the integrated A''-profile characteristics. We 

 shall now apply this new parameter to the radio data presented in detail 

 in section 6.2. The values oi H a and Hy, utilized are those for standard 

 sea-level conditions; i.e., 12.5 km and 7.5 km, respectively. 



6.3.5. Comparison of Radio-Meteorological Parameters 



The various radio-meteorological parameters discussed in section 6.1 

 plus n as derived from the Rantoul and Joliet radiosondes were tested 

 for their relative utility by comparison with the radio data of WBKB-TV 

 and WEXR-TV (see table 6.4). Correlation coefficients between the 

 radio data (3-hourly medians) of each path and the various radio- 

 meteorological parameters were determined for each of the profile cate- 

 gories given in table 6.5 as well as for all available data. It was not 

 possible to fit all of the data into the various categories since these were 

 deliberately made very strict in order to explore the utility of each 

 parameter within each of the propagation mechanisms assumed for the 

 profile categories (table 6.3). Thus it is observed that the sum of the 

 individual categories does not equal all available data. The results of 

 these correlations are given in table 6.6. Before discussing these results 

 it is well to note that the crossover height of the tangent rays from each 

 end of the path were calculated by detailed ray tracing [15] for each radio- 

 sonde ascent. The values as determined from the Rantoul and Joliet 

 soundings were averaged. This average crossover height was then used 

 to determine the contribution to the values of 11 below the crossover 



