The performance of geomagnetic field measuring instruments is quite good now. However, our life styles are changing with urbanization, and sometimes this has a bad influence on the environment of observations. Vehicles which run near an observation point are especially troublesome, making it difficult to keep the progress of data quality. We aimed to build a system to monitor artificial disturbances, to be completed in 2006. Using this system, we expect to obtain more accurate analytical results.
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