88 A WORLD ATLAS OF ATMOSPHERIC RADIO REFRACTIVITY 



180 150 120 90 



30 60 



180 150 120 90 



60 30 



60 90 120 150 



FIGURE C-49. Lapse rate of refractivity (N/fcm) exceeded 25 percent of time for 100-m layer: August. 



Figure C-50. Lapse rate of refractivity (N/fon) exceeded 10 percent of time for 100-m layer: August. 



