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THE ASTRONOMICAL BACKGROUND 1 The optical windows in the earths atmosphere
The discovery of radio waves from the Galaxy
The general structure of the universe
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aerial amplitude angle angular appear associated assumed atmosphere beam brightness calculated centre changes Chapter close clouds compared component considerable corresponds cosmic rays density depends detected determined diameter difficulty direction distance distribution earth echo effect electron elevation example fact field flare fluctuations follows frequency fringe gain galactic galaxies give given greater height hour hydrogen important increase intensity interferometer ionized ionosphere km/sec known light limit magnetic magnitude mass Mc/s mean measurements meteor motion moving Nebula noise observed obtained occurs orbit origin output pattern period phase photographic plane polar position possible present radiation radio echo radio source radio waves range receiver record region relative represent rotation showers shown in Fig shows signal simple solar space spectrum stars surveys technique telescope temperature theory tion trail variation velocity wavelength width