Abstract
As radio wave spectral line observations are made at ever shorter wavelengths, the need for precise calibration increases. This is because, as a larger portion of the frequency spectrum becomes available for observation, an increasing number of multiple molecular transistions will be detected. To obtain reliable excitation parameters from these detections they must be calibrated accurately at each frequency. Linsky1 has proposed the Moon as a radiometric standard for observations of extended sources in the infrared, millimetre and microwave portions of the spectrum. We therefore measured the ratio of the quiet Sun temperature to that of the centre of the new Moon at 231 GHz(λ = 1.3mm).
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Linsky, J. L., Astrophys. J. Suppl. Ser., 25, 163 (1973).
Schneider, M. V., and Wrixon, G. T., Proc. Int. Microwave Conf. Atlanta, 1974.
Bastin, J. A., Gear, E. A., Jones, G. O., Smith, H. J., and Wright, P. J., Proc. R. Soc., A 278, 543 (1964).
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WRIXON, G., SCHNEIDER, M. Ratio of the temperatures of the quiet Sun and the centre of the new moon at λ = 1.3 mm. Nature 250, 314 (1974). https://doi.org/10.1038/250314a0
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DOI: https://doi.org/10.1038/250314a0
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