%0 Journal Article
%T Multi-decadal to centennial secular variation of the main geomagnetic field<br>主磁场长期变化十年至百年尺度的周期
%A 白春华
%A 徐文耀
%J 地球物理学报
%D 2010
%I 
%X In this paper, the technique of wavelet transform is applied to analyze the gufm1 models during 1590~1990 A.D., for detecting the periodicities in the secular variations of the main geomagnetic field. Our analysis suggests that there are three principal periodic components in the total Pole-strength of B field: a stable 30-year periodic component which is mainly seen in the equatorial component g11 of the dipole field, and it is also generally seen in the non-dipole field; second, a dispersive quasi 50-year periodic component, typically contributed by the axial component of the dipole field g01, and the quadrupole also has a definite contribution; the last one is an intensity varying 110-year periodic component on centennial time scale, which seems to be from the equatorial component of the dipole field, and the octupole field also has a contribution.
%K Main geomagnetic field
%K Secular variation
%K Wavelet analysis
%K Periodicity<br>主磁场
%K 长期变化
%K 小波分析
%K 周期性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=4775C15964F7637447D5CA2FA26B97BF&yid=140ECF96957D60B2&vid=8E6AB9C3EBAAE921&iid=E158A972A605785F&sid=46CB56AABC2765FF&eid=58AAF01A97187A3A&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=43