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本文用最大相关时间描写两台地磁场垂直分量日变形态的位相关系。通过恰当的数据处理方式,从两台(北京台和武汉台)地磁垂直分量的整点值计算出最大相关时间。它的平均值等于两台的地方时差。此外最大相关时间还有明显的以年为周期的季节性变化,变化幅度约为0.7小时。对最大相关时间作了傅氏分析,结果表明它含有周期为29.8±0.6天和13.7±0.2天,振幅约为0.06小时的周期变化。
In this paper, the maximum correlation time is used to describe the phase relationship between the daily deformation of two vertical components of geomagnetic field. Through the appropriate data processing methods, the maximum correlation time is calculated from the integral values of the geomagnetic vertical components of two stations (Beijing and Wuhan). Its average is equal to the time difference of two places. In addition, the maximum correlation time is also obvious seasonal changes in the annual cycle, the change of about 0.7 hours. Fourier analysis of the maximum correlation time showed that it contained periodic changes of 29.8 ± 0.6 days and 13.7 ± 0.2 days with amplitudes of about 0.06 hours.