Flux densities of celestial radio sources at 15.5 and 31.6 GHz

Astronomy and Astrophysics – Astronomy

Scientific paper

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Microwave Emission, Planetary Radiation, Radiant Flux Density, Radio Astronomy, Radio Stars, Block Diagrams, Jupiter (Planet), Orion Constellation, Radio Sources (Astronomy), Radio Telescopes, Satellite Communication, Venus (Planet)

Scientific paper

This paper discusses flux densities of radio waves measured at 15.5 and 31.6 GHz omitted by radio stars Cas A, Tau A, Cyg A, Virgo A, the Orion Constellation, Venus and Jupiter. Such measurements are useful in determining the gain of large-aperture antennas for satellite communication. The spectral index of the flux density of Cas A, which had been believed to decrease rapidly above 7 GHz, was found to be constant up to 30 GHz, and the flux density of Venus was also clarified. We used an antenna with diameter of 7 m and a high-sensitivity radiometer in which a new beam-switching system and a low-noise parametric amplifier were built. Furthermore, attenuation in the atmosphere was exactly taken into account and many drift curves were averaged to get high-accuracy results.

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