M. Ball

I looked at the electrical voltages measured at the two end stations and the corner station during the lockloss associated with the power glitch during the thunderstorm on 7/24 at 3:56 UTC.

I have attached an image of the voltage signals at these stations and DARM during the glitch showing little to no power dip during this time. Unfortunately, the sample rate of the voltage monitors is too low to see full oscillations, so I can only say with confidence there was less than 10% dip in power.

I have also attached microphone spectrograms from 10 minutes on either side of the lock loss, and there are no signs of thunder around this time.