Accession Number:

ADA196542

Title:

Analysis of Temperature and Velocity Microturbulence Parameters from Aircraft Data and Relationship to Atmospheric Refractive Index Structure

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1988-05-01

Pagination or Media Count:

180.0

Abstract:

Due to inherent turbulence, the atmosphere has a temporally and spatially variable refractive index, which degrades propagating electromagnetic radiation. C sub nsq. is a key parameter for describing refractive variations. Data was analyzed from several instruments involved in an electro-optics meteorology experiment scintillometer thermosonde radar vertical profiler, and instrumented aircraft. The aircraft measured C sub Tsq. and C sub usq. using hot and cold wire sensors and FM recording apparatus. The taped data was processed via FFT to produce one-dimensional variance spectra wavenumber range 0.01 to 10m. Flights usually produced a 10 km vertical profile processed to give roughly 0.5 km resolution. Spectral editing was based on regression analysis fit to -53 frequency dependence. A majority of spectra showed the classic inertial subrange. C sub nsq. and epsilon were calculated from C sub Tsq. and C sub usq., respectively. In active regions, the following relationship can be derived. C sub Tsq.C sub usq. 1.6 R sub iP sub r - R sub i thetag del thetadel z.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE