北京台磁暴出现频次及△Z/△H的初步分析/
PRELIMINARY ANALYSIS OF THE OCCURRENCE FREQUENCY AND △Z/△H OF GEOMAGNETIC STORMS AT BEIJING OBSERVATORY
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摘要: 本文利用北京台1957-1978年共22年的磁暴资料,统计分析了磁暴出现频次及△Z/△H随世界时、季节和年份的变化,初步研究了它们的频谱和与太阳活动性的关系,获得了可供磁暴预报与地磁预报地震探索研究参考的若干有意义的结果。Abstract: Changes in the occurrence frequency and AZ/AH of geomagnetic stroms are preliminarily analyzed using 22-year storm data of 1957-1978 at Beijing Observatory in this paper. Statistical results show that 23-00-01-02 h of universal time (UT) are superior hours, and March, April, September, October in a year are superior months for storm occurrence frequency. There is a relation between storm occurrence frequency and solar activity. Changes in the oc-cuirence frequencies of various storms have a periodicity that correlate with the 11-year cycle of solar activity to a certain extent. The change in △Z/△H of SC-type variations has 22-year and 1.4-year periodicities, but the periodicity is not distinct. The change in △Z/△H of the main phase of geomagnetic storms has 22-vear, 11-year, 1.1-year periodicities, and the spectral peak of the 1.1-year period is very noticeable.
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[2] 布赖姆,E. O.,快速傅里叶变换,165——193, 1979,上海科技出版社.
[3] 祁贵仲、詹志佳、侯作中、范国华、王志刚、白彤霞,渤海地区地磁短周期变化异常、上地慢高导层的分布及其与唐山地震的关系,中国科学,1981, 7: 869——879,
[4] 中国科学院地球物理研究所第十研究室一组,地磁场的空间相关性及其在地震预报中的应用,地球物理学报,1977 20 169一184,
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