局部地区高空磁场的计算方法

本文用曲面样条函数表示地磁场及其水平梯度在地面上的分布, 从而使A.J.Zmuda提出的计算高空磁场的方法更加简便。本文还给出了借助于局部地区地磁场的球谐分析, 计算高空磁场的方法。 

METHODS OF COMPUTATION OF GEOMAGNETIC FIELD AT GREATER ALTITUDE IN A LOCAL REGION

In this paper two methods have been given to calculate the geomagnetic fields at great altitudes in a local region.In the first method surface spline is used to express the distribution of the geomagnetic fields and its horizontal gradient on the ground surface, the formulas areThe surface spline can express both normal distribution and anomalous distribution of the geomagnetic fields, and also geomagnetic horizontal gradient, so the use of surface spline makes Zmuda’s method simpler.The other method is with the aid of spherical harmonic analysis of the geomagnetic fields in a local region, the procedure is(1)to compute a set of spherical harmonic coefficients based on the geomagnetic data on the ground surface in a local region, (2)to compute the geomagnetic fields at great altitudes by using these coefficients.