¶ 70 Hz Line
Description:
70 Hz Line glitches are strong, monochromatic lines that started appearing in the third observing run (O3) and sit at around 70 Hz. These glitches happened only at LIGO-Livingston during a few days in April 2019. A loud feature at 70 Hz shorter than 0.3 seconds is sometimes accompanied by a fainter one around 60 Hz.
Cause:
Interval shooting of Nikon camera in one of the end stations.
Status:
Extinct.
Examples:
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Audio Example:
Make sure to wear good headphones!
More Information: