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Proceedings Paper

Radar and aircraft observations of a layer of strong refractivity turbulence
Author(s): Frank D. Eaton; Gregory D. Nastrom; Bruce S. Masson; Ila L. Hahn; Kimberley A. McCrae; Scott R. Nowlin; Timothy L. Berkopec
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Paper Abstract

The Air Force Research Laboratory at Kirtland Air Force Base examined the characteristics of the refractive index structure parameter (C2n) within a strong and persistent layer of turbulence using observations obtained from a 49.25 MHz radar and an instrumented C-135E aircraft at the Atmospheric Profiler Research Facility at White Sands Missile Range, NM on January 23, 1997. The aircraft measurements sensed the atmospheric temperature structure parameter (C2T) with fine-wire aerothermal probes for deriving C2n while the radar measurements provided C2n from Bragg scatter at turbulent scales in the clear air. The aircraft results provide horizontal spatial information at the specific altitudes flown while the radar-obtained values show temporal profile information. Flight legs approximately 200 km long were flown along the wind direction at eight different altitudes from 11.01 km to 12.21 km MSL. The turbulent layer and direction of flights were selected from the VHF radar-obtained C2n and wind measurements prior to take-off. Presentations include a range-height display of the patterns of refractivity turbulence obtained from the aircraft measurements and a range-height display derived from the radar observations corresponding to the aircraft results. Both range-height displays were produced by assuming Taylor's hypothesis and applying the actual wind profile to the time-height data. The evolution and persistency of features is discussed. A statistical evaluation comparing the two different methods of sensing C2n is presented. Salient features of the aircraft sensors and radar are discussed.

Paper Details

Date Published: 8 September 1998
PDF: 9 pages
Proc. SPIE 3381, Airborne Laser Advanced Technology, (8 September 1998); doi: 10.1117/12.323944
Show Author Affiliations
Frank D. Eaton, Air Force Research Lab. (United States)
Gregory D. Nastrom, St. Cloud State Univ. (United States)
Bruce S. Masson, Air Force Research Lab. (United States)
Ila L. Hahn, Air Force Research Lab. (United States)
Kimberley A. McCrae, Air Force Research Lab. (United States)
Scott R. Nowlin, Air Force Research Lab. (United States)
Timothy L. Berkopec, MZA Associates Corp. (United States)


Published in SPIE Proceedings Vol. 3381:
Airborne Laser Advanced Technology
Todd D. Steiner; Paul H. Merritt, Editor(s)

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