SQUIDセンサを用いた地磁気計測システムの開発と都市ノイズの測定

抄録

Geomagnetic field changes are expected prior to volcanic eruptions because temperature and pressure changes associated with magma flows in surrounding rock give rise to temporal magnetic anomalies. It was planned to monitor temporal magnetic changes by a SQUID (Superconducting QUantum Interference Device) sensor in the vicinity of the Sakurajima volcano in an attempt to study the relation between volcanic activity and variations in the geomagnetic field. This paper describes the development of the geomagnetic field sensing system using the SQUID sensor and the measurement of electromagnetic environmental noise generated in Kagoshima city.