Measurement of Schumann Resonance at Kamioka

[摘要] On the stochastic gravitational-wave search, correlated noise in two or more gravitational-wave detectors can be a serious problem. Schumann resonance is the name of a standing wave of electromagnetic fields, which is one of the correlated noise sources for the second-generation gravitational-wave detectors. We measured the noise levels of the environmental magnetic field both inside and outside the mine of KAGRA site at Kamioka. In this letter, we report the result of the measurement and compare the amplitude of magnetic fields inside and outside the mine to find possible issues or gain of constructing a detector underground.

[发布机构] Department of Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro-ku, Tokyo; 152-8551, Japan^1;Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo; 113-0032, Japan^2;Department of Biology and Geosciences, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka; 558-8585, Japan^3;Department of Physics, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka; 558-8585, Japan^4;Institute for Cosmic Ray Research, University of Tokyo, 5-1-5, Kashiwa-no-Ha, Kashiwa City, Chiba; 277-8582, Japan^5;Division of Physics Mathematics and Astronomy, California Institute of Technology, 1200 E, California Blvd, Pasadena; CA; 91125, United States^6

[关键词] Correlated noise;Environmental magnetic fields;Gravitational wave detectors;Noise levels;Schumann resonances;Second generation;Standing wave