中国地区地磁异常静日（AQD）的初步分析

本文将G.M.Brown等人对离Sq电流体系焦点较远处台站的异常静日（AQD）的H分量分析,发展为对包括Sq电流体系焦点附近台站和Z、D分量在内的AQD分析。主要分析了中国五个地磁台D、H、Z三要素静日最大值和最小值出现时间的分布,及其季节变化和逐年变化规律。结果表明,D、Z也有和H类似的AQD现象,其出现的年频度,也有与太阳黑子数反相变化的趋势。在有三个多太阳周资料的佘山台,太阳极小年AQD(Zmax)出现的频度,和随后的太阳极大年的黑子数R呈近似线性的关系。最后,本文对今后我国开展变化磁场的分析研究提出了建议。

ANALYSES OF GEOMAGNETIC AQD IN CHINA AREA

The analyses of the AQD （Hmin） for stations away from the Sq focus by G. M. Brown et al. have been extended to the cases not only of H but also of Z and D for the stations both away and near the 5, focus. The time distribution when the maximum and minimum of D, H, Z occur at five stations in China and their seasonal and solar-cycle variations have been analysed. It is found that there is also the marked solar control of the day-to-day variability in the phase of the solar diurnal variation. The number of occasions when the phase of H, Z or D in quiet day is outstandingly anomalous show marked diurnal, seasonal, and solar-cycle variations. There are also inverse correlations between the abnormalities of Z and D and sunspot number. At Sheshan having the data for more than three solar-cycles, there is also linear correlation between the annual mean percentage number of occurrences of AQD （Zmax） in solar minimum year and the sunspot number in following sunspot maxima. So it is possible to predict the sunspot maxima even using the geomagnetism data of stations near the Sq focus.