Energy input at large scales, loss at small scales
Kolmogorov distribution 
for Kolmogorov
= mean square fluctuation
Limited range of scale sizes play a role
Figure 13: Scale sizes responsible for scintillation. (i) 
(ii)
. Below A phase deviation is less that 1 radian. Below B path is
less than the Fresnel distance so no interference. From Lyne & Graham-Smith
1990 [23]