地磁场水平梯度的计算与分析

In this paper，based on the Gauss theory of geomagnetism and the spherical harmonic mi}del of the geomagnetic field，the horizontal gradients of the geomagnetic field in north一south and west-;east dlrections were calculated in Chinese and"its surrounding regions, the contour maps of the horizontal gradients of the geomagnetic components were constracted，and its regularities of distributions were analysed.
The horizontal gradients of the total intensity (F)，horizontal intensity (H) and vertical intensity (Z ) vary mainly with lat

CALCULATIONS AND ANALYSES OF THE HORIZONTAL GRADIENT OF THE GEOMAGNETIC FIELD

In this paper, based on the Gauss theory of geomagnetism and the spherical harmonic model of the geomagnetic field, the horizontal gradients of the geomagnetic field in north-south and west-east di-rections were calculated in Chinese and its surrounding regions, the contour maps of the horizontal gradients of the geomagnetic components were constracted, and its regularities of distributions were analysed. The horizontal gradients of the total intensity (F) , horizontal intensity (H) and vertical intensity (Z) vary mainly with latetude, it won't make much difference to vary with longitude. The horizontal gradient of the declination (D) varies not only with latitude, but also with longitude. There was maximum (absolute value) of the horizontal gradients of the horizontal intensity (H) in the central region of the East-Asian magnetic anomaly, and there was maximum of the horizontal gradients of the total intensity (F) in the central region of China. These phenomena merit attention.