CM4模型数据与台站实测数据的对比研究

本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2002年隆尧地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z,分析了各场源磁场随时间的变化特征。磁层源磁场及其感应场呈现出11年和27天的周期性变化,有些年的27天周期性变化显著,有些年则不太显著;电离层源磁场及其感应场具有明显的季节变化,不同年相同季节的变化形态一致但幅度不同;日变化分析显示,磁静日和磁扰日期间的模型数据与台站实测数据变化一致性较好,相关性较高。

Comparison of CM4 Model Data and the Measured Data of the Station

By use of the newest Comprehensive Model 4, this article calculates, from the year of 1982 to 2002 at Longyao geomagnetic observatory, the core field, crust field, magnetosphere field and its induction field, ionosphere field and its induction field. And the characteristic of each field source changing over time from geomagnetic north component (X), geomagnetic east component (Y), geomagnetic vertical component (Z) is also calculated and analyzed. The annual rate of the core field shows the characteristic of annual change. The value of crust field is constant. Magnetosphere field and its induction field show the characteristic for a long period over 11 years change, in which there is an obvious change for a short time over 27 days in some years while the others are not. Ionosphere field and its induction field show the characteristic of obvious seasonal change and the same one season has the same changing morphology, but the range changes differently. Time mean variation analysis shows the model data from magnetically quiet day, and magnetically disturbed day which are well coincided with test data from the geomagnetic observatory and they are also consistent.