18:39 UTC Lockloss from NLN Lockloss
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1374777588
No obvious earthquakes, Wind mildly gusty up to 20+ mph but unusually high. Analysis failed but the plots have some motion before the lockloss which are interesting.
18:55 UTC lockloss while relocking certainly due to poor alignment.
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1374778448
I looked at the LSC/SQZ channels that are plotted using lockloss select and compared them to when H1:ASC-AS_A_DC_NSUM_DQ saw the lockloss(attachment1) (replaced top left channels with H1:ASC-AS_A_DC_NSUM_DQ in yellow), to me at least it looks like they all changed after the lock loss? Basing this partially off of what was said in alog 71659.
I went through the summary pages, and the corner station HAM6 magnetic noise spectrogram (attachment2, attachment3) looks off to me before and during the time of the lockloss. Typically it looks like the magnetic noise here will suddenly jump due to a lockloss (see 1:45UTC on attachment2 or attachment3), but for whatever reason the noise jumped ~24 minutes before the lockloss.
However, it does look like this jump has happened a couple other times (july5, july21-smaller) without causing us to lose lock, so possibly not related.
The spectrogram is created as x2+y2+z2 of the channels H1:PEM-CS_MAG_LVEA_OUTPUTOPTICS_X_DQ, H1:PEM-CS_MAG_LVEA_OUTPUTOPTICS_Y_DQ, and H1:PEM-CS_MAG_LVEA_OUTPUTOPTICS_Z_DQ. Unfortunately I am currently having issues getting data from LDVW so I'm not able to look into it more closely.
