Abstract: In the past year, one measurement has been of great interest to those that we support and that is the measurement of optical turbulence or more specifically the refractive index structure coefficient. It is well understood that this parameters is affected by such factors as cloud cover, humidity, wind, solar loading and surface conditions. We present here field measurements from several locations where all of the environmental factors effecting turbulence have been measured along with the turbulence itself. This field data was compared with the US Army Atmospheric Sciences (ASL) Laboratory model called IMTURB. The results of this comparison are presented with comments on areas of improvement both in accuracy and in ease of use.!3
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