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Measurements of r0 and θ0: two decades and 18 sites

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Abstract

We present a statistical analysis of r0 and θ0 measurements collected over the last 2 decades at 18 different sites. Although the site altitudes varied from sea level to 3 km, the major distinguishing feature between average r0 values was the presence or absence of a turbulent, atmospheric boundary layer above the surface. For locations without a strong boundary-layer inversion, the mean coherence length, r0, was 93 ± 6 mm and the mean isoplanatic angle, θ0, was 9.4 ± 0.5 µrad. Where a boundary-layer inversion was present, the corresponding values for r0 and θ0 were 53 ± 2 mm and 6.5 ± 0.5 µrad, respectively.

© 1997 Optical Society of America

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