SM ALL项目数字化地磁资料可靠性分析

Reliability analysis of digital geomagnetic data in SMALL item

在对中美合作 SMALL (中国低纬地磁台阵 )项目安装在北京地磁台 (白家疃 )和云南通海地磁台的磁通门磁力仪记录资料与磁变仪模拟记录资料进行了详细的对比分析后 ,得出的结果表明 ,两者的日变形态、日变幅有较好的一致性 ,所选特定事件的变化幅度非常一致 ,说明磁通门磁力仪记录到的变化磁场的资料是真实可靠的。尽管目前磁通门磁力仪的基线值存在温度影响和离散度较大的问题 ,但随温度变化有明显的规律性 ,若能采取改进观测条件和观测方法以及缩短观测时间等措施 ,并对基线值进温度校正 ,磁通门磁力仪完全可以提供长期连续可靠的资料。而其为地震预报 ,空间环境预报 ,为日地物理 ,空间物理和地磁学的研究提供的高精度、高分辨率、连续可靠的数字化变化磁场资料是磁变仪模拟记录无法比拟的。

The detailed contrast analysis is carried out between the digital records by magnetic flux magnetometers and simulant records by variometers which are installed at Geoma gnetic Station of Beijing(Baijiatuan)and at that of Tonghai for the SMALL item cooperated by China and America.The result shows that both the diurnal shape and the diurnal fluctuation have better consistency for the two records,which indicates that the data of varying magnetic field recorded by magnetic flux magnetometer is reliable.Though the base line value of magnetic flux magnetometer is influenced by temperature and largely discrete,it can be improved by temperature correct.If the observation condition and method are improved and the observation time is shorten,the magnetic flux magnetometer can provide more precision and higher resolution data tha that simulant data recorded by variometers for earthquake prediction,spatial environment prediction,solar terrestrial physics,space physics and geomagnetism.