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Proceedings Paper

Opacity measurements at Summit Camp on Greenland and PEARL in northern Canada with a 225 GHz tipping radiometer
Author(s): Keiichi Asada; Pierre L. Martin-Cocher; Chien-Ping Chen; Satoki Matsushita; Ming-Tang Chen; Yau-De Huang; Makoto Inoue; Paul T. P. Ho; Scott N. Paine; Eric Steinbring
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Paper Abstract

We report the first measurements of 225 GHz atmospheric opacity at Summit Camp (Latitude 72°.57 N; Longitude 38°.46 W; Altitude 3250 m) in Greenland and the Polar Environment Atmospheric Research Laboratory (PEARL: Latitude 80°.05 N; Longitude 86°.42 W; Altitude 600 m) in Northern Canada with a tipping radiometer. Summit Camp and PEARL are research stations mostly interested in meteorology and geophysics, and they are potentially excellent sites for astronomical observations at sub-millimeter wavelength. We purchased a tipping radiometer from Radiometer Physics GmbH. After a test run at the summit of Mauna Kea, Hawaii, the radiometer was deployed to PEARL in February 2011, and relocated to Summit Camp in August 2011. The atmospheric opacity has been monitored from February 14th to May 10th, 2011 at PEARL and since August 2011 at Summit Camp. The median values of the measured opacity at PEARL ranged from 0.11 in February to 0.19 in May; Summit Camp varied in the range from 0.04 to 0.18 between August 2011 and May 2012. Summit Camp in Greenland is expected to be an excellent site for sub-millimeter and Terahertz astronomy, and we plan to set up there a 12-m telescope for VLBI and single-dish observations.

Paper Details

Date Published: 17 September 2012
PDF: 10 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84441J (17 September 2012); doi: 10.1117/12.925793
Show Author Affiliations
Keiichi Asada, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Pierre L. Martin-Cocher, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Chien-Ping Chen, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Satoki Matsushita, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Ming-Tang Chen, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Yau-De Huang, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Makoto Inoue, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Paul T. P. Ho, Academia Sinica Institute of Astronomy and Astrophysics (Taiwan)
Harvard-Smithsonian Ctr. for Astrophyics (United States)
Scott N. Paine, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Eric Steinbring, National Research Council Canada (Canada)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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