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Thirty-Year Period in Secular Variation of the Main Geomagnetic Field
- Source :
- Chinese Journal of Geophysics, 2006, 49 (5), pp.1210-1219
- Publication Year :
- 2022
-
Abstract
- During the centennial period from 1900 to 2000, the globally averaged unsigned annual rate of the main geomagnetic field experienced a three-episode variation. The maximum annual rates occurred respectively around 1910-1920, 1940-1950, and 1970-1980, showing a 30-year period. In addition, the rising phase in each episode is much shorter than declining phase. The governing factor of this periodic variation is non-dipole field, instead of the dipole field, although the secular variation of the magnetic energy concerned with the dipole is dominative over all other multiples.
- Subjects :
- Physics - Geophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- Chinese Journal of Geophysics, 2006, 49 (5), pp.1210-1219
- Publication Type :
- Report
- Accession number :
- edsarx.2209.06486
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1002/cjg2.946