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yexuqing木蟲(chóng)之王 (文學(xué)泰斗)
太陽(yáng)系系主任
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[交流]
Invariance of dynamo action in an early-Earth model
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Invariance of dynamo action in an early-Earth model 早期地球模型中的發(fā)電機(jī)作用不變性 ▲ 作者:Yufeng Lin, Philippe Marti & Andrew Jackson ▲鏈接: https://www.nature.com/articles/s41586-025-09334-y ▲摘要: 在此,我們展示了揭示了在早期地球地核極低黏度條件下,發(fā)電機(jī)作用具有不依賴(lài)流體粘度的特性。 我們的早期地球幾何模型產(chǎn)生的磁場(chǎng)強(qiáng)度和形態(tài),不僅與遠(yuǎn)古時(shí)期古地磁數(shù)據(jù)相符,同時(shí)與現(xiàn)代地磁場(chǎng)表現(xiàn)出顯著相似性。這一發(fā)現(xiàn)提出了固態(tài)內(nèi)核在產(chǎn)生觀測(cè)到的地磁場(chǎng)時(shí)空變化中的作用的新問(wèn)題。 ▲ Abstract: Here we show dynamo actions that are independent of fluid viscosity in the correct geometry of the Earth’s core in the deep past at extremely low viscosity, demonstrating the negligible role of fluid viscosity in our dynamo simulations. Our early-Earth geometry models produce magnetic field intensity and morphologies that are compatible with the palaeomagnetic data in the deep past while showing remarkable similarity to the present-day magnetic field. This raises questions about the role of the solid inner core in producing the spatial-temporal variations of the observed Earth’s magnetic field. |

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