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本文对北京、青光、昌黎、广州、佘山、武昌、长春等7个地磁台1973—1977五年期间80个磁暴的振幅谱进行了分析和对比,得到中低纬度地区磁暴频谱的一般特性.结果表明:①7个台磁暴频谱的变化趋势同步;②在周期0.5—6.8小时的频率范围内,振幅谱的斜率 b 值相当稳定,反映了在此频段内磁暴能量具有恒定的分配因子;③广州、佘山、武昌、长春四台振幅谱截矩 a 的年均值相当稳定,而距唐山震区较近的北京、青光、昌黎三台 a 的年均值均有不同程度的显著变化.这可能与1976年7月28日强烈的唐山地震有关.
This paper analyzes and compares the amplitude spectra of 80 magnetic storms during the five geomagnetic stations of Beijing, Qinghai, Changli, Guangzhou, Sheshan, Wuchang and Changchun in the period of 1973-1977, and obtains the general characteristics of the magnetic storms spectrum in the middle and low latitudes. The results show that: (1) the trends of the magnetic storm surges in seven stations are synchronous; (2) the slope b of the amplitude spectrum is quite stable in the frequency range of 0.5-6.8 hours, which indicates that the magnetic storm energy has a constant distribution factor in this frequency range; , Sheshan, Wuchang, Changchun, four annual amplitude amplitude spectral cutoff a relatively stable average annual, while from Tangshan earthquake near Beijing, Qingguang, Changli Santai a significant changes in the average annual average, which may be related to On July 28, 1976, the strong Tangshan earthquake was related.