FTS measurements of submillimeter-wave opacity at Pampa la Bola

Hiroshi Matsuo; Akihiro Sakamoto; Satoki Matsushita

doi:10.1117/12.317417

31 July 1998 FTS measurements of submillimeter-wave opacity at Pampa la Bola

Hiroshi Matsuo, Akihiro Sakamoto, Satoki Matsushita

Proceedings Volume 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes; (1998) https://doi.org/10.1117/12.317417
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The first measurement of submillimeter-wave atmospheric opacity spectra at the Pampa la Bola site (Northern Chile, Atacama 4800 m altitude) has been performed during the winter season using a Fourier transform spectrometer (FTS). Atmospheric emission spectra, as a function of airmass, were measured under various weather conditions. Atmospheric opacity was evaluated from sky temperature at zenith as well as from tipping measurements, which are independent measure but give consistent results. The FTS opacity measurements also show good match with 220 GHz radiometer measurements. Correlations between millimeter-wave and submillimeter-wave opacities get worse when 220 GHz opacity is larger than 0.1. Deviations from the opacity correlation at each frequency show good correlations themselves but have different relative variations at each frequency. This indicates that atmospheric transparency cannot be characterized only by millimeter-wave opacity buy requires simultaneous opacity measurements at millimeter and submillimeter-wavelengths.

Citation Download Citation

Hiroshi Matsuo, Akihiro Sakamoto, and Satoki Matsushita "FTS measurements of submillimeter-wave opacity at Pampa la Bola", Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); https://doi.org/10.1117/12.317417

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