磁异常
磁异常指观测到的磁场与理论预测的磁场之间存在的差异。 IGRF通常用作区域值,扣除长波长的区域值后就是剩余磁异常。磁异常的形态由以下几点决定:(a) 磁体的几何形状;(b) 地磁方向;(c) 磁体剩磁方向及强度;(d) 观察系统与地磁之间的相对方位。
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