Abstract
Environmental magnetic noises changing with time influences biomagnetic meaurements. Trains, movements of elevators and cars, and fan-pumps of air conditioners and computer servers are thought to be the main causes. The influence is significant when biomagnetic measurement is performed without a magnetically shielded room. In this paper, the variation of environmental magnetic noise was measured in two places, Kagoshima University and Tokyo Denki University. The origin of magnetic field noise is discussed with respect to magnetic field generated by electric trains and streetcars. The magnetic noise at Kagoshima University is larger than that at Tokyo Denki University. As a result of the current measurements, it was confirmed that the magnetic noise at Kagoshima University is affected by streetcars.
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