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Turbulence structure function parameters retrieved in presence of ducting from the VHF radar and UHF wind profiler at Aberystwyth

Sengupta, N. and Glover, I.A. and Hooper, D.A. (2005) Turbulence structure function parameters retrieved in presence of ducting from the VHF radar and UHF wind profiler at Aberystwyth. In: XXVIIIth General Assembly of the International Union of Radio Science (Union Radio-Scientifique Internationale-URSI), 2005-10-23 - 2005-10-29.

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Abstract

Tropospheric ducts, which can lead to anomalous radio wave propagation, are formed by a decrease of humidity with height, an increase in temperature with height or a combination of both. An analysis of radiosonde data for July 2000 and June 2001 has established the presence of elevated ducts on several occasions. Turbulence structure function constant (Cn 2) profiles, measured using co-located VHF and UHF wind-profiling radars, show duct associated enhancement Inconsistencies between the profiles for the two radars are attributed to significant contributions to scattering at the lower frequency due to processes other than classical turbulence. Some of the data examined underlines the care needed in the reliable extraction of turbulence parameters in the presence of Rayleigh scattering from rain.