Reanalysis of the 1992 south pole millimetre-wavelength atmospheric opacity data

被引:8
作者
Chamberlin, RA [1 ]
机构
[1] Caltech Submillimeter Observ, Hilo, HI 96720 USA
来源
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | 2004年 / 21卷 / 03期
关键词
instrumentation : miscellaneous; methods : data analysis; site testing; atmospheric effects;
D O I
10.1071/AS03012
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In 1992 an NRAO 225-GHz site survey heterodyne radiometer was placed at the Geographical South Pole. The instrument operated over an entire annual cycle and provided direct measurements of the millimetre-wave sky brightness temperature as a function of zenith angle. Interpreted in a single-slab 'skydip' radiation transfer model of the atmosphere, these sky brightness measurements provided a time series of the millimetre atmospheric opacity. Statistics derived from this opacity time series were important for making comparisons with other candidate millimetre and sub-millimetrewave astronomy sites. This paper reexamines the 1992 measurements and the original analysis. Details of the skydip fit model, radiometer gain error, instrument stability, and a mid-season replacement to a window in the instrument enclosure combined to cause a modest under-reporting of the atmospheric opacity in previous reports. Unchanged are earlier conclusions that dry air makes a significant contribution to the total opacity at 225 GHz.
引用
收藏
页码:264 / 274
页数:11
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