French Global Network of Geomagnetic observatories

The Bureau Central de Magnétisme Terrestre (BCMT) is a French organization founded in 1921 and attached to the Institut de Physique du Globe de Paris (IPGP). Two French institutions are involved in BCMT operations: IPGP and École et Observatoire des Sciences de la Terre de Strasbourg (EOST). The primary mission of the BCMT is to provide ground geomagnetic observations of the highest quality to the scientific community, in France and abroad. To achieve its mission, the BCMT operates a network of magnetic observatories distributed worldwide, including the National Magnetic Observatory located at Chambon-la-Forêt, France. Each observatory is equipped with two types of magnetometers: A three-axis vector magnetometer and an absolute scalar magnetometer. Calibration measurements are made regularly by an operator at each magnetic observatory. Vector data, scalar data and calibration data are gathered to obtain fully calibrated set of definitive values of the magnetic field vector at the observatory position along time. BCMT data are available on its website (www.bcmt.fr) and on Intermagnet’s website (www.intermagnet.org). The data are under license CC BY-NC 4.0.

地球磁场中央局（Bureau Central de Magnétisme Terrestre, BCMT）是一家成立于1921年的法国机构，隶属于巴黎地球物理研究所（Institut de Physique du Globe de Paris, IPGP）。共有两家法国机构参与BCMT的运营工作：IPGP与斯特拉斯堡地球科学学院及天文台（École et Observatoire des Sciences de la Terre de Strasbourg, EOST）。BCMT的核心使命是为法国及海外科学界提供最高质量的地面地磁观测数据。为达成这一使命，BCMT运营着一张遍布全球的地磁观测台站网络，其中包括位于法国尚邦拉福雷的国家地磁观测台。每座观测台均配备两类磁力仪：三轴矢量磁力仪与绝对标量磁力仪。各观测台的操作人员会定期开展校准测量作业。通过采集矢量数据、标量数据与校准数据，可得到观测台位置处经完整校准的磁场矢量随时间变化的确定值集合。BCMT的数据可通过其官方网站（www.bcmt.fr）以及国际地磁观测台网（Intermagnet）的官方网站（www.intermagnet.org）获取，相关数据采用CC BY-NC 4.0许可协议发布。