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地磁场的模式除了球谐模式和偶极子模式以外,还有电流环模式。地磁场的球谐模式使用广泛,但它不能反应地磁场场源的实际状况;地磁场的偶极子模式只能很近似地反应地磁场场源的状况;为此,有些学者提出用若干个电流环表示地磁场的分布,偶极子是电流环的特殊情况,当电流环的半径为零时,电流环就变为偶极子,电流环模式比偶极子模式能更好地表示地磁场场源的实际状况。
In addition to the spherical mode and dipole mode, there are current loop modes. The spherical harmonic mode of geomagnetic field is widely used, but it can not reflect the actual state of the magnetic field source. The dipole mode of the geomagnetic field can only reflect the state of the magnetic field source very closely; for this reason, some scholars propose to use several The current loop represents the distribution of the earth’s magnetic field, and the dipole is a special case of a current loop. When the current loop radius is zero, the current loop becomes a dipole, and the current loop mode represents better than the dipole mode The actual state of the magnetic field source.