目前,表达地磁场的模式主要有三种:第一种是用球谐级数表示地磁场的分布,叫作地磁场的球谐模式;第二种是用若干个偶极子表示地磁场的分布,叫作地磁场的偶极子模式;第三种是用若干个电流环表示地磁场的分布,叫作地磁场的电流环模式。一般地说,球谐分析方法是最常用的方法,但是,它不能反应地磁场场源的实际状况,这是地磁场球谐模式的不足之处,所以,有些学者提出用放在地球内部的若干个偶极子来表示地磁场的分布,试图 At present, there are mainly three modes for expressing geomagnetic field: the first one is that the spherical harmonic series represents the distribution of geomagnetic field, which is called the spherical harmonic mode of geomagnetic field; the second one is the distribution of geomagnetic field with several dipoles , Called the dipole mode of the geomagnetic field; the third is to use a number of current loop that the distribution of geomagnetic field, known as the geomagnetic current loop mode. In general, the spherical harmonic analysis method is the most commonly used method, but it can not reflect the actual state of the magnetic field source, which is the inadequacy of the spherical magnetic mode of the geomagnetic field. Therefore, some scholars propose to use the method A number of dipoles to represent the distribution of the Earth’s magnetic field, trying