FTS measurements of submillimeter-wave atmospheric opacity at Pampa la Bola

被引:50
作者
Matsuo, H [1 ]
Sakamoto, A
Matsushita, S
机构
[1] Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
[2] Grad Univ Adv Studies, Dept Astron Sci, Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
关键词
earth; atmosphere; instruments; spectroscopy; submillimeter-wave; opacities;
D O I
10.1093/pasj/50.3.359
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The first measurements of submillimeter-wave atmospheric opacity spectra at the Pampa la Bola site (Northern Chile, Atacama, 4800 m altitude) have 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 the zenith as well as from tipping measurements, which are independent measures but give consistent results. Correlation diagrams between 220 GHz and 345 GHz, 410 GHz, 492 GHz, 675 GHz, 691 GHz, 809 GHz, 875 GHz are shown. 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, but requires simultaneous opacity measurements at millimeter and submillimeter-wavelengths.
引用
收藏
页码:359 / 366
页数:8
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