The Impact of Atmospheric Fluctuations on Degree-scale Imaging of the Cosmic Microwave Background

Details The Impact of Atmospheric Fluctuations on Degree-scale Imaging of the Cosmic Microwave Background The Impact of Atmospheric Fluctuations on Degree-scale Imaging of the Cosmic Microwave Background

1999-05-27

arxiv.org/abs/astro-ph/9905369v2

Astrophys.J. 543 (2000) 787-798

Astronomy and Astrophysics

Astrophysics

29 pages, 7 figures, 1 table, appears in The Astrophysical Journal

Scientific paper

10.1086/317115

Fluctuations in the brightness of the Earth's atmosphere originating from water vapor are an important source of noise for ground-based instruments attempting to measure anisotropy in the Cosmic Microwave Background. This paper presents a model for the atmospheric fluctuations and derives simple expressions to predict the contribution of the atmosphere to experimental measurements. Data from the South Pole and from the Atacama Desert in Chile, two of the driest places on Earth, are used to assess the level of fluctuations at each site.

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