新老测点之间的地磁对比观测研究

１９９３年８─１１月，在马起乏与新测点上进行了较长时间的地磁场对比观测，获得了大量准确可靠的地磁资料。应用通化处理法、同步差值法、日变特征量比较法、快速谱分析法（ＦＦＴ）、幅比与位相差值法，分析研究了地磁对比观测资料。结果表明，在相同时间段内，各测点地磁变化形态相当一致，两个测点之间的同步差值平稳。由各测点地磁场总强度日变化的定量分析比较得出，其日变化是相当一致的。快速谱分析显示，在相同时间段内，各测点的幅度随周期的变化形态十分相似，总体上看，ＦＦＴ幅度随周期的减小呈下降趋势；从ＦＦＴ幅度Ａ，位相以及快谱幅比Ａ＿ｉ／Ａ与位相差的定量比较结果上看，各测点的ＦＦＴ有着良好的一致性。此外，还得到了新老测点之间的地磁数据的接点差。

Comparative observation and research of geomagnetic fieldbetween the new and the old sites

During August-November,1993,the comparative observations of geomagnetic fieldwere conducted at the Maqifa and the new sites for a long time,and obtained a lot of ac-curate and reliable geomagnetic data. Using the reduce processing method,synchronousdifference method,comparative method in character parameters of daily variation,FFTanalytical method,method of amplitude ratio and phase difference, we analyzed andstudied the geomagnetic data of comparative observations. The results show that themorphology of geomagnetic variations at various sites is quite consistent during the sameperiod,and the synchronous differences between two sites are stable. The quantitativeanalysis and comparison in daily variations of geomagnetic total intensity at various sitesobtained that the daily variations are quite consistent. The FFT analysis shows that thevariation shape of the amplitude with period at various sites is very similar. In general,the FFT amplitude shows decrease tendency when the period decreases. According tothe results of the quantitative comparison in the FFT amplitude A,the phase the am-plitude ratio A_i/A_0 and the phase difference,the FFT spectra at various sites havegood ag reement.The site differences of geomagnetic data between the new and the oldsites were obtained also.