东亚地磁非偶极场的变化特征研究

Change Charactristics of Geomagnetic the Non-dipole Field in East Asia

本文用国际地磁参考场研究东亚地磁非偶极场的时空分布和磁场强度的变化规律，并对其场源特性进行探讨．结果表明，１９４５年以来，东亚地磁非偶极场存在缓慢的北移和西向漂移．磁异常中心附近的磁场强度呈波动性增加．其场源可分为漂移场和稳定场两部分．

The geomagnetie non-dipole field in East Asia were caculated usingIGRF, and were analysed the variationcharacteristi c of its. Results show that the centrelocation of non-dipole field we re slow movement to nothward and westward at 45 year in-tervals fron 1945～1990.The non-dipole field intensity of z element there were about 15ye ar intervals for inereased or decreased.