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M. Evans, T. Mistry, T. R. Saravanan, T. Sadecki, T. Shaffer, T. Vo, V V Frolov, W. Parker, X. Chen, Y. Asali, Y. K. Lecoeuche, Z. M\\'arka","submitted_at":"2020-07-29T14:52:46Z","abstract_excerpt":"Noise due to scattered light has been a frequent disturbance in the Advanced LIGO gravitational wave detectors, hindering the detection of gravitational waves. The non stationary scatter noise caused by low frequency motion can be recognized as arches in the time-frequency plane of the gravitational wave channel. In this paper, we characterize the scattering noise for LIGO's third observing run O3 from April, 2019 to March, 2020. We find at least two different populations of scattering noise and we investigate the multiple origins of one of them as well as its mitigation. 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