Yasmeen Asali, Zsuzsa Marka

This work was performed during Detchar noise sprint at LLO, January 29-31, 2020. The main focus was LLO scattering_light glitches, however we repeated some of the studies for LHO as well and thus report them here.


Studied and compared the distribution of scattered_light glitches found by GravitySpy (confidence>=0.9) for all of O3a versus O3b (till January 17th). See distributions attached.

Observations:

1. Rate - ~ten-fold increase of scattered_light glitches found by GravitySpy.
All Scattered Light in O3A: 0.00056 (2.016 /hour) vs. All Scattered Light in O3B: 0.00563 (20.268 /hour)

2. We also looked into September and November (any seasonal effects?) to see how distributions compared to the rest of O3A and O3B, and found them to be very similar to the full runs.

3. We looked at how the number of scattered_light glitches evolved over time and found that scattered_light glitches occur in clusters, and the frequency and size of these clusters has drastically increased between O3A and O3B, see attached plot. 

For further information see full report at detchar f2f noise sprint wiki: https://docs.google.com/document/d/1YH2ffuDKNC9BeLbluroB_d2TkkdaQi6k6gF2IUirn4g