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<p>We consider the errors in determining the optical thickness of the atmosphere in the millimeter wavelength range from the absolute measurements of the brightness temperature of the sky taking into account various factors. The optimal measurement angle is found. It is shown that the errors in determining the optical thickness of the atmosphere from such measurements under normal conditions are mainly determined by calibration errors, errors in the average temperature of the atmosphere, and receiver instability. In this case, zenith is the optimal angle.</p>

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On Determination of the Atmospheric Optical Thickness from Absolute Measurements of Sky Brightness Temperature in the Millimeter Wavelength Range

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • I. I. Zinchenko,
  • E. A. Kopylov

摘要

We consider the errors in determining the optical thickness of the atmosphere in the millimeter wavelength range from the absolute measurements of the brightness temperature of the sky taking into account various factors. The optimal measurement angle is found. It is shown that the errors in determining the optical thickness of the atmosphere from such measurements under normal conditions are mainly determined by calibration errors, errors in the average temperature of the atmosphere, and receiver instability. In this case, zenith is the optimal angle.