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DOI | 10.1029/2021GL094692 |
Signatures of High-Latitude Waves in Observations of Geomagnetic Acceleration | |
Rodrigo Chi-Durá; n; Margaret S. Avery; Bruce A. Buffett | |
2021-10-06 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | Models for the second time-derivative of the geomagnetic field reveal prominent activity at high latitudes. Alternating patches of positive and negative geomagnetic acceleration propagate to the west at speeds that exceed nominal fluid velocities in the core. We show that waves are a viable interpretation of these observations. Magnetic Rossby waves produce a high-latitude response with suitable phase velocities. However, the spatial complexity of the prediction is not compatible with the observations. Our preferred interpretation involves zonal MAC waves. These waves can account for the observed geomagnetic field when a stratified layer exists at the top of the core. The required layer has a thickness in excess of 100 km and a buoyancy frequency comparable to the rotation frequency. We anticipate a gradual reduction in the phase velocity over time, leading to a future change in the propagation direction. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/339969 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Rodrigo Chi-Durá,n,Margaret S. Avery,et al. Signatures of High-Latitude Waves in Observations of Geomagnetic Acceleration[J]. Geophysical Research Letters,2021. |
APA | Rodrigo Chi-Durá,n,Margaret S. Avery,&Bruce A. Buffett.(2021).Signatures of High-Latitude Waves in Observations of Geomagnetic Acceleration.Geophysical Research Letters. |
MLA | Rodrigo Chi-Durá,et al."Signatures of High-Latitude Waves in Observations of Geomagnetic Acceleration".Geophysical Research Letters (2021). |
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