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通过对同一台站人工观测的地磁场总强度F与连续记录F,及两套连续记录仪记录的地磁场总强度F夜均值的差值分析,发现同一台站两种差值均存在显著的年变化特征。对其他台站同样可以看到类似变化。而各时段的时均值差值也表现出相似的变化特征。由此说明,同一台站地磁观测区的不同点位,地磁场差异在长时间内不断发生变化,在进行绝对观测时,无法通过选择绝对观测时间消除该差值变化。
Through the analysis of the difference between the total ground magnetic field strength F and the continuous record F and the mean total magnetic field strength F recorded by two continuous recorders at the same station, it is found that there are significant differences between the two stations on the same station Annual change characteristics. Similar changes can be seen for other stations as well. The time-averaged difference of each time period also showed similar change characteristics. This shows that at different points of the geomagnetic observational area at the same station, the differences of geomagnetic field continuously change over a long period of time. When the absolute observation is performed, the difference can not be eliminated by choosing the absolute observation time.