¶ Low Frequency Burst
Description:
Low frequency bursts have a number of morphologies, but often resemble small humps with a nearly triangular shape growing from low frequency (up to 20–30 Hz) to a peak and then dying back down over the course of up to a few seconds. During the course of the first observing run (O1), the LIGO Livingston detector was plagued by a non-linear effect that caused such bursts of noise at low frequency. This happens hundreds of times per day.
There is some evidence that low frequency bursts are caused by scattered light driven by motion of the output mirrors (used to point the beam into the output mode cleaner) at 1.6Hz. However, the cause of the 1.6Hz motion is not understood and the scattering path is not known.
Cause:
Potentially due to a certain form of scattered light.
Status:
Active.
Examples:
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Audio Example:
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