Analysis of Temperature and Velocity Microturbulence Parameters from Aircraft Data and Relationship to Atmospheric Refractive Index Structure
Abstract
Due to inherent turbulence, the atmosphere has a temporally and spatially variable refractive index, which degrades propagating electromagnetic radiation. (C sub n)sq. 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 T)sq. and (C sub u)sq. 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 10/m). 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 -5/3 frequency dependence. A majority of spectra showed the classic inertial subrange. (C sub n)sq. and epsilon were calculated from (C sub T)sq. and (C sub u)sq., respectively. In active regions, the following relationship can be derived. (C sub T)sq./(C sub u)sq. = 1.6 R sub i/(P sub r - R sub i) (theta/g) (del theta/del z).
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1988
- Accession Number
- ADA196542
Entities
People
- Elizabeth A. Beecher
Organizations
- Air Force Institute of Technology