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yexuqing木虫之王 (文学泰斗)
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Invariance of dynamo action in an early-Earth model
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Invariance of dynamo action in an early-Earth model 早期地球模型中的发电机作用不变性 ▲ 作者：Yufeng Lin, Philippe Marti & Andrew Jackson ▲链接： https://www.nature.com/articles/s41586-025-09334-y ▲摘要： 在此，我们展示了揭示了在早期地球地核极低黏度条件下，发电机作用具有不依赖流体粘度的特性。 我们的早期地球几何模型产生的磁场强度和形态，不仅与远古时期古地磁数据相符，同时与现代地磁场表现出显著相似性。这一发现提出了固态内核在产生观测到的地磁场时空变化中的作用的新问题。 ▲ 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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