摘要
本文利用地磁垂直分量静日变幅(Az),采用幅比法,求得各台的纬度因子(α),并从两个太阳周期变化中,分别研究了纬度因子随时间的变化特征,又利用二维幂多项式进行空间扫描,分析了平面分布图象。结果显示了在北纬25—30度之间,存在一条Az变迁带,其南、北两翼日变幅随纬度呈线型递减,从而用分季办法,建立计算α的公式,认为这一结果,对于校正地磁(△Z)日变纬度影响,有一定的参考意义。
In this paper the latitude factors (α(?)) of each stations are obtained by using the calm-day variation amplitude of geomagnetic vertical component (Az) through an amplitude-ratio method. The characteristics of the latitude factor change with time are studied in two variation periods of the Sun, and the plane distribution pattern analyzed by two-dimensional power polynomial space scanning. Results indicate that there exists an Az vicissitude zone in between 25-30°N, the diurnal fluctuations of both northern and southern sides will be linear depiction with latitude, thus a formula for calculating αα was established using the season by season method. It is thought that this result is of a certain reference value for adjusting the diurnal variation latitude effect of geomagnetism (△Z).
出处
《地震》
CSCD
北大核心
1991年第1期45-50,共6页
Earthquake
基金
国家地震局地震科学联合基金<利用地磁静日变探索大震前的磁信息>成果之一
