Date of Award

2022

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics and Astronomy

Committee Chair

Don A. Gregory

Committee Member

Kenneth Herren

Committee Member

Geoffrey N. Pendleton

Subject(s)

Radio waves -- Scintillation., Atmospheric turbulence., Refractive index.

Abstract

It has been well established that scintillation, or random fades and enhancements of a propagating wave due to turbulence-induced fluctuations of the refractive index, can have deleterious effects on radar and satellite communications systems, especially for frequencies above 10 GHz (3 cm). Kolmogorov theory characterizes turbulence along a given propagation path in terms of the refractive index structure parameter C(superscript 2)(subscript n) . Tropospheric scintillation models are typically driven by C(superscript 2)(subscript n)(z) profiles developed from atmospheric measurements/predictions of pressure, temperature, relative humidity, and wind speed/direction along a given propagation path. In this work, high-resolution distributions of outer-scale, wind shear, and squared buoyancy frequency will be analyzed and used to describe an alternative scintillation model. To conclude, the modified method will be invoked on Global Forecast System (GFS) data and the results compared to measurement data and predictions of existing models.

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