evan.goetz@LIGO.ORG - posted 16:31, Thursday 03 December 2015 - last comment - 21:18, Thursday 03 December 2015(23939)
Elevated H1 glitch rate and elevated microseism
Currently ~6m wave activity off the Pacific Northwest coast causing elevated microseism. Omicron glitch rate correspondingly rises, especially in the low frequency region. I attach an image showing microseism trend and Omicron glitchgram. Can we get clues to upconversion mechanisms from IFO data during this time?
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Evan G., Patrick T.
ISI Blend state is the same over this time period, nominal 45 mHz configuration (see attached). There was a brief time in the unlocked state where ETMX Y degree of freedom was switched but then switched back before relocking.
Wind is sub-10 mph.
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The summary pages show several optics, notably SRM and PRM, moving enough during this period to drive scattering fringes in the detection band. That's a likely cause for the low frequency glitches. Needs to be followed up to check the fringe prediction vs data for for some short specific times.
https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20151203/detchar/scattering/