Subtraction of correlated noise in global networks of gravitational-wave interferometers

Michael W. Coughlin; Nelson L. Christensen; Rosario De Rosa; Irene Fiori; Mark Gołkowski; Melissa Guidry; Jan Harms; Jerzy Kubisz; Andrzej Kulak; Janusz Mlynarczyk; Federico Paoletti; Eric Thrane

doi:10.1088/0264-9381/33/22/224003

Subtraction of correlated noise in global networks of gravitational-wave interferometers

Michael W. Coughlin, Nelson L. Christensen, Rosario De Rosa, Irene Fiori, Mark Gołkowski, Melissa Guidry, Jan Harms, Jerzy Kubisz, Andrzej Kulak, Janusz Mlynarczyk, Federico Paoletti, Eric Thrane

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The recent discovery of merging black holes suggests that a stochastic gravitational-wave background is within reach of the advanced detector network operating at design sensitivity. However, correlated magnetic noise from Schumann resonances threatens to contaminate observation of a stochastic background. In this paper, we report on the first effort to eliminate intercontinental correlated noise from Schumann resonances using Wiener filtering. Using magnetometers as proxies for gravitational-wave detectors, we demonstrate as much as a factor of two reduction in the coherence between magnetometers on different continents. While much work remains to be done, our results constitute a proof-of-principle and motivate follow-up studies with a dedicated array of magnetometers.

Original language	English (US)
Article number	224003
Journal	Classical and Quantum Gravity
Volume	33
Issue number	22
DOIs	https://doi.org/10.1088/0264-9381/33/22/224003
State	Published - Oct 26 2016
Externally published	Yes

Bibliographical note

Funding Information:
MC is supported by the National Science Foundation Graduate Research Fellowship Program, under NSF grant number DGE 1144152. NC work is supported by NSF grant PHY-1505373. ET is supported through ARC FT150100281. We would like to acknowledge Luciano Papi for his assistance in the Villa Cristina measurements.

Keywords

Schumann resonances
Wiener filter
correlated noise

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10.1088/0264-9381/33/22/224003

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Subtraction of correlated noise in global networks of gravitational-wave interferometers. / Coughlin, Michael W.; Christensen, Nelson L.; Rosa, Rosario De; Fiori, Irene; Gołkowski, Mark; Guidry, Melissa; Harms, Jan; Kubisz, Jerzy; Kulak, Andrzej; Mlynarczyk, Janusz; Paoletti, Federico; Thrane, Eric.

In: Classical and Quantum Gravity, Vol. 33, No. 22, 224003, 26.10.2016.

Research output: Contribution to journal › Article › peer-review

Coughlin, Michael W. ; Christensen, Nelson L. ; Rosa, Rosario De ; Fiori, Irene ; Gołkowski, Mark ; Guidry, Melissa ; Harms, Jan ; Kubisz, Jerzy ; Kulak, Andrzej ; Mlynarczyk, Janusz ; Paoletti, Federico ; Thrane, Eric. / Subtraction of correlated noise in global networks of gravitational-wave interferometers. In: Classical and Quantum Gravity. 2016 ; Vol. 33, No. 22.

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abstract = "The recent discovery of merging black holes suggests that a stochastic gravitational-wave background is within reach of the advanced detector network operating at design sensitivity. However, correlated magnetic noise from Schumann resonances threatens to contaminate observation of a stochastic background. In this paper, we report on the first effort to eliminate intercontinental correlated noise from Schumann resonances using Wiener filtering. Using magnetometers as proxies for gravitational-wave detectors, we demonstrate as much as a factor of two reduction in the coherence between magnetometers on different continents. While much work remains to be done, our results constitute a proof-of-principle and motivate follow-up studies with a dedicated array of magnetometers.",

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