华北地区地磁场长期变化的地区差异
REGIONAL DIFFERENCE FOR THE SECULAR VARIATION OF GEOMAGNETIC FIELD IN NORTH CHINA AREA
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摘要: 本文根据文献[1]给出的泰勒二次多项式曲面拟合方法,利用1980-1987年23个地磁台地磁总场F和Z分量实测资料,从年变率地区性差异方面进行了分析,从另一个侧面描述了地磁场长期变化的时空特征,达到了拟合与预测的目的。同时克服了文献[1]中外空干扰对年变率产生的系统拟合偏差的影响。此资料便于用差值法进行长期变改正,具有实用价值。Abstract: This paper, by Taylor's quadratic pol hernial surface fitting method given in Reference(1), analyses the regional difference of the annual variationa rate of observed data of geomagnetic total field F and Z component from 21 geomagntic station in 1980-1987 and describes the time-space charateristics of secular variations in geomagnetic field in another aspect, achieving our aim in fitting and prediction. The effect from outer space disturbanceon the systematic fitting deviaton of annual variational rate in Reference(1) has been remove by this mehtod. Such data are easier to be used in secular variation corrected of the difference between two stations in geomagnetic observation and prediction and will be a certain value in practical applications. This paper is one of the results of the studies on "Characteristic of Geomagnetic Regional background Variations and Its Application in Earthquake Prediction" funded by the Scientific Foundation of S. S. B.
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[1] 邓顺兴等,华北地区地磁场Z分量长期变化的拟合与预测,中国地震. Vol.4. No.4. 1988. [2] 林云芳等,东亚地区地磁非偶极子场长期变化分析,地球物理学报, Vol.28. No. 5,1985. [3] 卢振业等,华北地磁场长期变空间分布模式及其应用,地震科学研究. No.3. 1981. [4] 徐文耀等,中国地磁场的三维结构及长期变化,地球物理学报. Vol.24. No. 4. 1985. -
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