SUMMARY 



223 



■1600-1500 



-500 



DISTANCE FROM FRONT IN KILOMETERS 



Figure 5.60. Epoch chart, North Platte, Nebr., in A units. 



300 



5.8. Summary 



A survey such as this is designed to indicate the direction of radio 

 meteorological research. Among the brighter prospects is the work of 

 Moler et al., concerning the interrelation of refractive index structure and 

 mesoscale weather changes. Other synoptic features likely to have refrac- 

 tive index significance are the migratory high and low pressure cells of the 

 middle latitudes, since certain surface patterns and vertical profiles occur 

 frequently with a particular type of synoptic system. 



A knowledge of the meso-macroscale behavior of A'^ in a synoptic sense 

 enables the propagation engineer to anticipate the occurrence of super- 

 refraction or ducting conditions. Thus, meteorological conditions that 

 give rise to such phenomena as prolonged space-wave fadeouts and inter- 

 ference effects from elevated layers in the troposphere can to some extent 

 be planned for in advance. 



