17 September 2012 Where is Ridge A?
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Abstract
First identied in 2009 as the site with the lowest precipitable water and best terahertz transmission on Earth, Ridge A is located approximately 150 km south of Dome A, Antarctica. To further rene this optimum location prior to deployment in 2012 of a robotic THz observatory, we have modelled the atmospheric transmission as a function of location over a 1,000,000 km square grid using three years of data from the Microwave Humidity Sounder on the NOAA-18 satellite. The modelling identies a broad area of exceptionally low water vapour close to the 4,000 metre elevation contour, reaching below 100 microns for extended periods of time.
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Geoff Sims, Geoff Sims, Craig Kulesa, Craig Kulesa, Michael C. B. Ashley, Michael C. B. Ashley, Jon S. Lawrence, Jon S. Lawrence, Will Saunders, Will Saunders, John W. V. Storey, John W. V. Storey, "Where is Ridge A?", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84445H (17 September 2012); doi: 10.1117/12.925512; https://doi.org/10.1117/12.925512
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