期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 17, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL087940
关键词
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资金
- Fulbright Foreign Student Program
- National Agency for Research and Development (ANID) Scholarship Program/DOCTORADO BECAS CHILE [56150003]
- National Science Foundation [EAR-1915807, EAR-1725798]
Satellite observations reveal short pulses in the second time derivative of the geomagnetic field. We seek to interpret these signals using complex empirical orthogonal functions (CEOFs). This methodology decomposes the signal into traveling waves, permitting estimates for the period, angular wave number, and phase velocity. We recover CEOFs from the CHAOS-6 model, focusing on three geographic regions with strong secular acceleration. Two regions are confined to the equator, while the third is located under Alaska. We find evidence for both eastward and westward traveling waves with periods between 7 and 20 years. There is also evidence for weaker standing waves with complex spatial patterns. Two of the three regions have waves that are compatible with predictions for waves in a stratified fluid. Our results yield estimates for the structure of fluid stratification at the top of the core.
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