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E3/E4 PEM Correlations, Part I

Explore magnetic field correlations in power line monitors and fluxgate magnetometers at LIGO Hanford Observatory. Investigate coherence and significance levels of signals on varying timescales.

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E3/E4 PEM Correlations, Part I

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  1. E3/E4 PEM Correlations, Part I Michael Landry LIGO Hanford Observatory Detector Characterization Session N. Christensen, P. Fritschel, M. Ito, S. Klimenko, S. Marka, S. Mohanty, A. Ottewill, R. Rahkola, R. Schofield, J. Sylvestre LSC Meeting Aug 15, 01

  2. Magnetometer correlations • Top plot ~ 40 s • Bottom plot ~120s • not ELF • Gateway vertical refresh rate 69.9Hz • Not observed in endstation LSC Meeting Aug 15, 01

  3. Summary • Coherence in power line monitors and fluxgate magnetometers drops on minute timescale • Some indication of correlation in power line monitors seen on 10h time scales • 16Hz correlations? • Gateway vertical refresh rate: 69.9Hz alerts us that good clocks can be coherent on long timescales • GPS synch is a perfect clock • More sensitive coil magnetometers available at both sites for entire E5 run – PEM data to be merged soon • Seismic correlations need to be investigated LSC Meeting Aug 15, 01

  4. the coherence of signals sL(t) and sH(t+t), where t is a time delay between two signals. coherence coefficient significance level phase difference uniformity Coherence & Significance Level blk – power monitors (60Hz) red – magnetometers (60Hz) S. Klimenko ~1000sec

  5. Magnetometer correlations N. Christensen Intersite coherence: H0:PEM-BSC1_MAG1Y L0:PEM-EX_MAG1X LSC Meeting Aug 15, 01

  6. Power monitor correlations P. Fritschel LSC Meeting Aug 15, 01

  7. Power monitor correlations LSC Meeting Aug 15, 01

  8. Power monitor coherence LSC Meeting Aug 15, 01

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