The refractive index structure constant Cn2 is needed to characterize optical wave propagation in a refractive turbulent scattering medium. A limited number of in situ measurements of Cn2 made during day and night conditions from the surface to 10 km above sea level are compared in three different atmospheric boundary layer environments: dry convective, moist convective, and marine inversion. Cn2 on average appears to be higher through the convective boundary layer depth during the day compared to night for the same air mass type and location but is generally lower than night values within the stable marine inversion layer. Calculations of path scintillation effects for slant paths in the lower atmosphere at near‐infrared wavelengths are also compared for day and night conditions associated with the different air mass types.
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SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)AFRL/VSBY 14. ABSTRACT Equations are developed to estimate velocity turbulence from index of refraction turbulence as measured by the thermosonde. Using an adaptation of the radar "power" method to estimate velocity fluctuations from backscattered radar return and concurrently measured atmospheric data, the method is applied to optical turbulence measured by the thermosonde. The method is then used to compare velocity turbulence levels as estimated by the thermosonde to those estimated by the **GroundWinds" lidar in the lee of Mt. Washington in New Hampshire. There is reasonable agreement in identification of the areas of high turbulence.
SPONSOR/MONITOR'S REPORT NUMBER(S)AFRL
SUBJECT TERMS
ABSTRACTEquations are developed to estimate velocity turbulence from index of refraction turbulence as measured by the thermosonde. Using an adaptation of the radar "power" method to estimate velocity fluctuations from backscattered radar return and concurrently measured atmospheric data, the method is applied to optical turbulence measured by the thermosonde. The method is then used to compare velocity turbulence levels as estimated by the thermosonde to those estimated by the "GroimdWinds" lidar in the lee of Mt. Washington in New Hampshire. There is reasonable agreement in identification of the areas of higher turbulence.
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