globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.015
Scopus记录号: 2-s2.0-85045585362
论文题名:
A basal magma ocean dynamo to explain the early lunar magnetic field
作者: Scheinberg A.L.; Soderlund K.M.; Elkins-Tanton L.T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492
起始页码: 144
结束页码: 151
语种: 英语
英文关键词: geodynamics ; geodynamo ; lunar magnetism ; magma ocean
Scopus关键词: Geodynamics ; Interactive devices ; Moon ; Oceanography ; Convection model ; Geodynamo ; Magma ocean ; Magnetic field strengths ; Orders of magnitude ; Surface field ; Surface magnetic field ; Unsolved problems ; Magnetic fields ; geodynamics ; geodynamo ; heat flow ; magnetic field ; Moon ; paleomagnetism ; Calluna vulgaris
英文摘要: The source of the ancient lunar magnetic field is an unsolved problem in the Moon's evolution. Theoretical work invoking a core dynamo has been unable to explain the magnitude of the observed field, falling instead one to two orders of magnitude below it. Since surface magnetic field strength is highly sensitive to the depth and size of the dynamo region, we instead hypothesize that the early lunar dynamo was driven by convection in a basal magma ocean formed from the final stages of an early lunar magma ocean; this material is expected to be dense, radioactive, and metalliferous. Here we use numerical convection models to predict the longevity and heat flow of such a basal magma ocean and use scaling laws to estimate the resulting magnetic field strength. We show that, if sufficiently electrically conducting, a magma ocean could have produced an early dynamo with surface fields consistent with the paleomagnetic observations. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109908
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Princeton Plasma Physics Laboratory, Princeton, NJ 08543, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78758, United States; School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, United States

Recommended Citation:
Scheinberg A.L.,Soderlund K.M.,Elkins-Tanton L.T.. A basal magma ocean dynamo to explain the early lunar magnetic field[J]. Earth and Planetary Science Letters,2018-01-01,492
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