Skip to main content

The Atacama Cosmology Telescope: Modeling bulk atmospheric motion

Author(s): Morris, Thomas W; Bustos, Ricardo; Calabrese, Erminia; Choi, Steve K; Duivenvoorden, Adriaan J; et al

To refer to this page use:
Abstract: Fluctuating atmospheric emission is a dominant source of noise for ground-based millimeter-wave observations of the cosmic microwave background (CMB) temperature anisotropy at angular scales ≳0.5°. We present a model of the atmosphere as a discrete set of emissive turbulent layers that move with respect to the observer with a horizontal wind velocity. After introducing a statistic derived from the time-lag dependent correlation function for detector pairs in an array, referred to as the pair-lag, we use this model to estimate the aggregate angular motion of the atmosphere derived from time-ordered data from the Atacama Cosmology Telescope (ACT). We find that estimates derived from ACT’s CMB observations alone agree with those derived from satellite weather data that additionally include a height-dependent horizontal wind velocity and water vapor density. We also explore the dependence of the measured atmospheric noise spectrum on the relative angle between the wind velocity and the telescope scan direction. In particular, we find that varying the scan velocity changes the noise spectrum in a predictable way. Computing the pair-lag statistic opens up new avenues for understanding how atmospheric fluctuations impact measurements of the CMB anisotropy.
Publication Date: 17-Feb-2022
Electronic Publication Date: 17-Feb-2022
Citation: Morris, Thomas W, Bustos, Ricardo, Calabrese, Erminia, Choi, Steve K, Duivenvoorden, Adriaan J, Dunkley, Jo, Dünner, Rolando, Gallardo, Patricio A, Hasselfield, Matthew, Hincks, Adam D, Mroczkowski, Tony, Naess, Sigurd, Niemack, Michael D, Page, Lyman, Partridge, Bruce, Salatino, Maria, Staggs, Suzanne, Treu, Jesse, Wollack, Edward J, Xu, Zhilei. (The Atacama Cosmology Telescope: Modeling bulk atmospheric motion. Physical Review D, 105 (4), 10.1103/physrevd.105.042004
DOI: doi:10.1103/physrevd.105.042004
ISSN: 2470-0010
EISSN: 2470-0029
Keywords: cosmic microwave background, atmospheric emission, atmospheric modeling, turbulence
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review D
Version: Final published version. This is an open access article.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.