Dynamos in the Inner Solar System

IF 11.3 1区 地球科学 Q1 ASTRONOMY & ASTROPHYSICS
S. Tikoo, A. Evans
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引用次数: 5

Abstract

Dynamo magnetic fields are primarily generated by thermochemical convection of electrically conductive liquid metal within planetary cores. Convection can be sustained by secular cooling and may be bolstered by compositional buoyancy associated with core solidification. Additionally, mechanical stirring of core fluids and external perturbations by large impact events, tidal effects, and orbital precession can also contribute to sustaining dynamo fields. Convective dynamos cease when the core-mantle heat flux becomes subadiabatic or if specific crystallization regimes inhibit core fluid flows. Therefore, exploring the histories of magnetic fields across the Solar System provides a window into the thermal and chemical evolution of planetary interiors. Here we review how recent spacecraft-based studies of remanent crustal magnetism, paleomagnetic studies of rock samples, and planetary interior models have revealed the magnetic and evolutionary histories of Mercury, Earth, Mars, the Moon, and several planetesimals, as well as discuss avenues for future exploration and discovery. ▪ Paleomagnetism and remanent crustal magnetism studies elucidate the magnetic histories of rocky planetary bodies. ▪ Records of ancient dynamo fields have been obtained from 3 out of 4 terrestrial planets, the Moon, and several planetesimals. ▪ The geometries, intensities, and longevities of dynamo fields can provide information on core processes and planetary thermal evolution. Expected final online publication date for the Annual Review of Earth and Planetary Sciences, Volume 50 is May 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
内太阳系的发电机
发电机磁场主要是由行星核心内导电液态金属的热化学对流产生的。对流可以通过长期冷却来维持,也可以通过与岩心凝固有关的成分浮力来加强。此外,核心流体的机械搅拌和大撞击事件、潮汐效应和轨道进动引起的外部扰动也有助于维持发电机场。当地核-地幔热流变为次绝热或特定的结晶机制抑制地核流体流动时,对流发电机停止。因此,探索整个太阳系磁场的历史为了解行星内部的热化学演化提供了一个窗口。在这里,我们回顾了最近基于航天器的残余地壳磁力研究、岩石样本的古地磁研究和行星内部模型如何揭示了水星、地球、火星、月球和几个星子的磁场和演化历史,并讨论了未来探索和发现的途径。▪古地磁和残余地磁研究阐明了岩石行星体的磁史。▪从4个类地行星中的3个、月球和几个星子上获得了古代发电机场的记录。▪发电机场的几何形状、强度和寿命可以提供有关地核过程和行星热演化的信息。《地球与行星科学年度评论》第50卷的最终在线出版日期预计为2022年5月。修订后的估计数请参阅http://www.annualreviews.org/page/journal/pubdates。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Annual Review of Earth and Planetary Sciences
Annual Review of Earth and Planetary Sciences 地学天文-地球科学综合
CiteScore
25.10
自引率
0.00%
发文量
25
期刊介绍: Since its establishment in 1973, the Annual Review of Earth and Planetary Sciences has been dedicated to providing comprehensive coverage of advancements in the field. This esteemed publication examines various aspects of earth and planetary sciences, encompassing climate, environment, geological hazards, planet formation, and the evolution of life. To ensure wider accessibility, the latest volume of the journal has transitioned from a gated model to open access through the Subscribe to Open program by Annual Reviews. Consequently, all articles published in this volume are now available under the Creative Commons Attribution (CC BY) license.
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