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Title:Venus: measurements of microwave brightness temperatures and interpretations of the radio and radar spectra
Author(s):Warnock, William W.
Director of Research:Dickel, John R.
Department / Program:Astronomy
Discipline:Astronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D. (doctoral)
Genre:Dissertation
Subject(s):Venus
Microwave radiation
Radio Astronomy
Radar spectra
Abstract:Fifteen years ago passive microwave radiation from Venus was first measured (Mayer, et al., 1958). Nearly one hundred sets of radio observations have now been published, for wavelengths ranging from 0.1 to 70 cm. For these wavelengths, Planck's radiation law can be replaced by the Rayleigh-Jeans approximation, in which the brightness of the source is proportional to the first power of its blackbody temperature. For observations made with a single radio telescope, no significant resolution over the disk of Venus is possible. In the reductions of such observations, the planet is assumed to radiate uniformly over its disk. The measured flux density is then proportional to the diskaveraged brightness temperature, defined as the temperature of a perfect radiator subtending the same solid angle as Venus and emitting the same flux density of radiation at the wavelength of observation. The disk-averaged brightness temperature is often called simply the brightness temperature, and its variation with wavelength defines the radio spectrum of the planet.
Issue Date:1971-09
Publisher:Department of Astronomy. College of Library Arts and Sciences. University of Illinois at Urbana-Champaign.
Genre:Dissertation / Thesis
Type:Text
Language:English
URI:http://hdl.handle.net/2142/79024
Date Available in IDEALS:2015-08-07


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