期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 16, 页码 6622-6629出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL064733
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资金
- Japan Society for the Promotion of Science (JSPS) [26800232]
- JSPS Postdoctoral Fellowships for Research Abroad
- Natural Environment Research Council of the UK, NERC [NE/I012052/1]
- NERC [NE/I012052/1] Funding Source: UKRI
- STFC [ST/J501086/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [26800232] Funding Source: KAKEN
- Natural Environment Research Council [NE/I012052/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/J501086/1] Funding Source: researchfish
The westward drift component of the secular variation is likely to be a signal of waves riding on a background mean flow. By separating the wave and mean flow contributions, we can infer the strength of the hidden azimuthal part of the magnetic field within the core. We explore the origin of the westward drift commonly seen in dynamo simulations and show that it propagates at the speed of the slow magnetic Rossby waves with respect to a mean zonal flow. Our results indicate that such waves could be excited in the Earth's core and that wave propagation may indeed play some role in the longitudinal drift, particularly at higher latitudes where the wave component is relatively strong, the equatorial westward drift being dominated by the mean flow. We discuss a potential inference of the RMS toroidal field strength within the Earth's core from the observed drift rate.
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