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Title:
Atmospheric transparency at 350 MU M wavelength
Authors:
Radford, S. J. E.; Holdaway, M. A.; Peterson, J. B.
Affiliation:
AA(NRAO), AB(NRAO), AC(CMU)
Publication:
American Astronomical Society, 192nd AAS Meeting, #48.06; Bulletin of the American Astronomical Society, Vol. 30, p.884
Publication Date:
05/1998
Origin:
AAS
Bibliographic Code:
1998AAS...192.4806R

Abstract

Comparative measurements of atmospheric transparency are underway at three sites of current or proposed telescopes for submillimeter wavelength astronomy: the South Pole (2835 m), Mauna Kea (CSO, 4070 m), and Chajnantor, Chile (5000 m). At each site, the transparency is determined from the sky brightness measured by a broadband tipping photometer about four times per hour. These instruments are based on ambient temperature pyroelectric detectors and have resonant metal mesh filters that define a passband matched to the 350 mu m atmospheric window. Two internal loads are used to calibrate the detector response. The instrument on Mauna Kea is being cross calibrated against a 225 GHz tipping radiometer, 808--846 GHz heterodyne measurements (CSO), 350 mu m broadband (SCUBA on JCMT) measurements, and broadband spectroscopy (FTS on CSO). On Chajnantor, the tipping photometer is cross calibrated against a 225 GHz tipping radiometer and a broadband spectrometer (FTS). Cumulative distributions of the measured zenith optical depth indicate the amount of time at these sites suitable for submillimeter wavelength observations. The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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