No description available.

M.Sc. (Geography) / In this study the spatial and temporal variation of radio-refractivity over southern Africa is investigated. Climatological data from 8 upper-air stations and 49 surface stations were used and transformed. into values of refractivity to establish a data base of radio refractivity information. The spatial analysis yielded maps of surface refractivity (Ns ) and height corrected surface refractivity (No) for southern Africa. In order to calculate the height correction factors, a radio-climatological classification of southern Africa was drawn: up. These maps are a refinement of the existing maps published by the CSIR. The temporal analysis consisted of graphs of mean monthly and yearly values of various refractivity- (Ns, Delta N, K-factor) and climatological (temperature, vapour pressure) factors for the eight upper-air stations. Some preliminary information about ducting was also obtained from this analysis. A spatial-temporal analysis of limited extent was then performed for one station to obtain an indication of the factors leading to the formation of radio ducts, as well as the actual variation of refractivity with height. Information about the variation of refractivity over southern Africa was thus obtained, with emphasis on macroscale variation as well as preliminary information about ducting conditions.

Thesis (M.Sc.)--University of Melbourne, Dept. of Science, 1974. / Typescript (roneo copy). Includes bibliographical references (leaves 104-105).

Thesis (M.S.)--Florida State University, 2005. / Advisor: Dr. Xiaolei Zou, Florida State University, College of Arts and Sciences, Dept. of Meteorology. Title and description from dissertation home page (viewed Sept. 29, 2005). Document formatted into pages; contains xvi, 119 pages. Includes bibliographical references.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1979. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND LINDGREN. / Includes bibliographical references. / by Joel Berman. / M.S.

Thesis (M.S. in Systems Engineering (Electronic Warfare))--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Davidson, Kenneth L. Second Reader: Hershey, Scott H. "September 1990." Description based on title screen as viewed on December 29, 2009. Author(s) subject terms: Retractive conditions, prongation, Central America, radar, microwave. Includes bibliographical references (p. 60-61). Also available in print.

Thesis (M.S. in Systems Engineering (Electronic Warfare))--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Davidson, Kenneth L. ; Powell, James R. "September 1990." Description based on title screen as viewed on December 29, 2009. DTIC Descriptor(s): Frequency, Electronic Warfare, Aircraft, Airborne, Electronic Equipment, Microwave Equipment, Radar, Profiles, Ducts, Meteorology, Communication And Radio Systems, Refraction, Arabian Sea, Refractometers, Military Operations. DTIC Identifier(s): Radar interference, meteorological phenomena, theses. Author(s) subject terms: Refractivity, Arabian Sea refractive conditions, ESM airborne radar, airborne microwave refractometer (AMR), IREPS, EREPS. Includes bibliographical references (p. 96-97). Also available in print.