地磁总强度梯度的计算与分析

不仅要知道地磁场的分布规律,而且要知道地磁场梯度的分布规律。本上根据地磁场的高斯理论和地磁场的球谐模型,计算出中国及其邻近地区地磁总强度的水平梯度(南北方向和东西方向)和垂直梯度,绘制出相应的等值线图,并分析了总强度梯度的分布规律。地磁总强度的水平梯度和垂直梯度,主要随纬度变化,与经度关系不大。值得注意的是在我国的中心地区,地磁总强度的水平梯度值最大。

CALCULATION AND ANALYSIS OF THE GRADIENT OF THE TOTAL GEOMAGNETIC INTENSITY

We should know not only the distribution pattern of the geomagnetic field but also the distribution pattern of the geomagnetic field gradient. Based on the Gauss theory and the spherical harmonic model of the geomagnetic field, this paper has calculated the horizontal gradient (in SN and EW directi ons) and vertical gradient of the total geomagnetic intensity for China and its neighboring areas, drawn the corresponding contour map and analysed the distribution pattern of the total intensity gradient.The horizontal gradient and vertical gradient of the total geomagnetic intensity vary mainly with the latitude and have little to do with the longitude. It is worth noticing that the horizontal gradient value of the total geomagnetic intensity is highest in the central part of China.