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Proceedings Paper

Scintillation And Turbulence Measurements; Comparisons Over A Horizontal Path
Author(s): Edmund A Murphy; Robert R Beland; James H Brown; Peter J Thomas
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Paper Abstract

Turbulence parameters are determined from measurements along a 183 m line-of-sight at Palm Bay, Florida and a 300 m path at Sudbury, Massachusetts. A horizontal scintillometer is used to obtain o 2, the variance of log amplitude of the irradiance, and the path-averaged C 2, the atmospheric refractive index structure constant. Thermosondes are also used to obElain Cn2 at several locations along the optical path. The mean C2 is determined from three thermosondes and compared to that from the scintillometer. Statistics obtained from processing the 2 sec sampled data over 10 minute periods are presented. Excellent agreement is obtained between the two systems when averaged over 10 minutes. Statistics obtained over shorter periods show a considerable variation in the Cn2 estimates within the 10 minute period. The range of variation within 10 minute intervals can exceed 50%. Volume averaging, wind speed and direction fluctuations are discussed as possible causes of short time variations in the Cn2 estimates.

Paper Details

Date Published: 10 August 1988
PDF: 8 pages
Proc. SPIE 0926, Optical, Infrared, Millimeter Wave Propagation Engineering, (10 August 1988); doi: 10.1117/12.945809
Show Author Affiliations
Edmund A Murphy, Air Force Geophysics Laboratory (United States)
Robert R Beland, Air Force Geophysics Laboratory (United States)
James H Brown, Air Force Geophysics Laboratory (United States)
Peter J Thomas, Air Force Geophysics Laboratory (United States)

Published in SPIE Proceedings Vol. 0926:
Optical, Infrared, Millimeter Wave Propagation Engineering
Norman S. Kopeika; Walter B. Miller, Editor(s)

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