Publications of the Astronomical Society of Australia | |
Reanalysis of the 1992 South Pole Millimetre-Wavelength Atmospheric Opacity Data | |
Richard A. Chamberlin1  | |
关键词: instrumentation: miscellaneous; methods: data analysis; site testing; atmospheric effects; | |
DOI : 10.1071/AS03012 | |
学科分类:天文学(综合) | |
来源: CSIRO | |
【 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-millimetre wave 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.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040531830ZK.pdf | 541KB | download |