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本文应用1970—1979年部分磁暴急始资料,对我国7个三分量地磁台站记录到的一些磁暴急始进行了统计分析。所得结果表明,在我国昌黎、兰州、佘山磁暴急始垂直分量的变化幅度明显偏大(急始的垂直分量变化△Z的平均值分别为:昌黎9.2nT、兰州4.9nT、佘山5.3nT,而长春、北京、武汉、广州等台站则为1.5—3.0nT,垂直分量与水平分量变化的比值△Z/△H的平均值分别为:昌黎0.22,兰州0.20,佘山0.16,其余台站为0.02—0.10)。初步认为,这可能是由于这些台站地下存在着局部电性构造异常引起的。
Based on the preliminary data of some storms from 1970 to 1979, this paper makes a statistical analysis on some emergency records of storms recorded by seven three-component geomagnetic stations in China. The results show that in the Changli, Lanzhou and Sheshan, the variation of vertical component of geomagnetic storm in Changli is obviously larger (the average value of vertical component change △ Z in Changli is 9.2nT in Changli, 4.9nT in Lanzhou and 5.3nT in Sheshan respectively While the stations of Changchun, Beijing, Wuhan and Guangzhou were 1.5-3.0nT. The average of the ratio of vertical component to horizontal component of △ Z / △ H were: Changli 0.22, Lanzhou 0.20, Sheshan 0.16, and the remaining stations were 0.02 -0.10). It is preliminarily believed that this may be due to the presence of local electrical structural anomalies in the subsurface of these stations.