Enhanced NoiseFloorMon : offline analysis results R. Stone & S. Mukherjee Center for Gravitational Wave Astronomy Department of Physics and Astronomy University.

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Enhanced NoiseFloorMon : offline analysis results R. Stone & S. Mukherjee Center for Gravitational Wave Astronomy Department of Physics and Astronomy University of Texas at Brownsville. LSC-Virgo Meeting, Baton Rouge, LA March 21, 2007 DCC # LIGO-G

Outline Review NoiseFloorMon Describe recent revisions Discuss monitor output and channels monitored Offline results Examine threshold crossings To do list

Introduction NoiseFloorMon is a median-based noise floor tracker in operation at L0 and H0 The monitor tracks slow non-stationarities as opposed to glitches or sharp transients. The monitor was developed in 2005 and tested on- site and has been in operation throughout S5

Changes made … Earlier : Tracking AS_Q. Frequency bands: 0-20, , and Hz. Percentage threshold crossings are recorded and minute trends stored. Offline analysis: - looking at trends on a daily basis - comparison with BurstMon output - activities in different frequency bands - correlation with SenseMon output Now : Tracking AS_Q and all seismic channels. Frequency bands : 0-16, 16-32, 32-64, Hz. Minute trends of max threshold crossing and cross correlations with the seismic channels stored. Offline analysis : -looking at trends on a daily basis -studying cross correlations with the seismic channels -Looks up other monitors for comparison.

Location of results/ reports … People … Daily update is made (mostly automated/minimal supervision) and can be accessed at : Some analysis results/shift summaries can also be found at : People who have been involved at various stages of this work S. Mukherjee (algorithm and main code); Roberto Grosso (DMT code); R. Stone (present offline analysis). Past result web page maintenance : T. Inoue & M. Oyervides (undergraduate students).

Typical output

List of auxiliary channels studied EX_SEISXEY_SEISX EX_SEISYEY_SEISY EX_SEISZEY_SEISZ LVEA_SEISXMX_SEISY LVEA_SEISYMY_SEISX LVEA_SEISZMY_SEISY MX_SEISXMY_SEISZ MX_SEISZ H0:PEM-L0:PEM- EX_SEISXLVEA_SEISY EX_SEISYEY_SEISX EX_SEISZEY_SEISY LVEA_SEISXEY_SEISZ LVEA_SEISY

H1

H2

L1

HO Threshold Crossing 0-16 Hz

LO Threshold Crossing 0-16 Hz

LO Threshold Crossing Hz

Future … Continue analyzing S5 and future data. Look for correlation with other monitor results. Make a time-frequency study to see what actually happened during the threshold crossing epochs leading to understanding the relation between the AS_Q and the auxiliary channel in question. Extend the study to micro-seismic band. Chart weekly and monthly trends A new monitor … MicroseisMon ?