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Atmospheric Transmission at Dome C between 0 and 10 THz

  • L. Spinoglio, N. Epchtein, N. Schneider (a1), V. Minier (a1), G. Durand (a1), P. Tremblin (a1), J. Urban (a2) and P. Baron (a3)...

Abstract

We present model calculations of the atmospheric transmission for DOME C in Antarctica for frequencies up to 10 THz (30 μm) using the forward model MOLIERE-5. Measurements of precipitable water vapor (pwv), obtained by the SUMMIT radiometer installed at the Concordia station during 2008 and working at a wavelength of 200 μm, are translated into atmospheric transmission using MOLIERE. Quartiles of transmission, calculated from 200 μm data are extrapolated to 350 μm and compared to the CCAT (Cornell-Caltech Atacama Telescope) site in Chile. It turns out that for 25% of the time at DOME C (CCAT), the transmission is around 20% (5%) at 200 μm. This corresponds to a pwv of 0.18 mm for DOME C. At 350 μm, for 50% of time at DOME C (CCAT) the transmission is around 55% (25%). This corresponds to a pwv of 0.22 mm for DOME C. These results show that DOME C is one of the best observing sites on Earth for submm-astronomy with respect to high atmospheric transmission over long time periods.

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[1] Clough, S.A., Shepard, M.W., Mlawer, E.J., et al., 2005, J. Quant. Spec. Rad. Transfer, 91, 233
[2] Lord, S., 1992, NASA Techn. Memo., 1203957
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Atmospheric Transmission at Dome C between 0 and 10 THz

  • L. Spinoglio, N. Epchtein, N. Schneider (a1), V. Minier (a1), G. Durand (a1), P. Tremblin (a1), J. Urban (a2) and P. Baron (a3)...

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