地磁三要素
地磁三要素-
本文介绍了1980.0年中国地磁正常场图的编绘和地磁正常场数学模式的建立使用不同年代观测的地磁三要素资料2000余个，经过通化改正，统统改正到1980.0这个特定年代。
In this paper a mathematical model was given for drawing geomagnetic field chart of China in 1980.0 . More than 2000 three-element data of different years have been used to draw the geomagnetic field chart of China in 1980.0 by using Taylor polynomial and least square method .