Periodical Characteristics of the Geomagnetic Secular Variation and Length-of-Day Variation
详细信息
- 责任者：Kang Guofa (Department of Geophysics ; Yunnan University ; Kunming 650091 ; China) ; Bai Chunhua
- 刊名：Chinese Journal of Geophysics
- 出版年：2008
- 卷期：51(2)
- 关键词：日变化 ; diurnal variations ; 地磁长期变化 ; secular variation
- 页码：p.369-375
- 图表：4 illus., 32 refs
- 分类号：0400
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
///Based on the historical geomagnetic model GUFM1 and the 10th International Geomagnetic Reference Field models (IGRF10) and the length-of-day data series, the secular variation of some parameters, including geomagnetic moment and its energy and westward drift etc, are analyzed with the wavelet transform method, in addition to the periodical components and time-varying characteristics of decadal length-of-day variation. As the results suggest that, during the period of 1800 ~ 2005, the 82-year and 48-year quasi-periodic components are available for the secular variation of dipole magnetic field, which are not directly related to the periodicity of the length-of-day variation.