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Proceedings Paper

FTS measurements of submillimeter-wave opacity at Pampa la Bola
Author(s): Hiroshi Matsuo; Akihiro Sakamoto; Satoki Matsushita
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Paper 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.

Paper Details

Date Published: 31 July 1998
PDF: 12 pages
Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); doi: 10.1117/12.317417
Show Author Affiliations
Hiroshi Matsuo, Nobeyama Radio Observatory (Japan)
Akihiro Sakamoto, Nobeyama Radio Observatory (Japan)
Satoki Matsushita, Nobeyama Radio Observatory (United States)

Published in SPIE Proceedings Vol. 3357:
Advanced Technology MMW, Radio, and Terahertz Telescopes
Thomas G. Phillips, Editor(s)

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