气候变化领域集成服务门户(CCPortal): Crustal and time-varying magnetic fields at the InSight landing site on Mars

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DOI	10.1038/s41561-020-0537-x
	Crustal and time-varying magnetic fields at the InSight landing site on Mars
	Johnson C.L.; Mittelholz A.; Langlais B.; Russell C.T.; Ansan V.; Banfield D.; Chi P.J.; Fillingim M.O.; Forget F.; Haviland H.F.; Golombek M.; Joy S.; Lognonné P.; Liu X.; Michaut C.; Pan L.; Quantin-Nataf C.; Spiga A.; Stanley S.; Thorne S.N.; Wieczorek M.A.; Yu Y.; Smrekar S.E.; Banerdt W.B.
发表日期	2020
ISSN	17520894
卷号	13 期号:3
英文摘要	Magnetic fields provide a window into a planet’s interior structure and evolution, including its atmospheric and space environments. Satellites at Mars have measured crustal magnetic fields indicating an ancient dynamo. These crustal fields interact with the solar wind to generate transient fields and electric currents in Mars’s upper atmosphere. Surface magnetic field data play a key role in understanding these effects and the dynamo. Here we report measurements of magnetic field strength and direction at the InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) landing site on Mars. We find that the field is ten times stronger than predicted by satellite-based models. We infer magnetized rocks beneath the surface, within ~150 km of the landing site, consistent with a past dynamo with Earth-like strength. Geological mapping and InSight seismic data suggest that much or all of the magnetization sources are carried in basement rocks, which are at least 3.9 billion years old and are overlain by between 200 m and ~10 km of lava flows and modified ancient terrain. Daily variations in the magnetic field indicate contributions from ionospheric currents at 120 km to 180 km altitude. Higher-frequency variations are also observed; their origin is unknown, but they probably propagate from even higher altitudes to the surface. We propose that the time-varying fields can be used to investigate the electrical conductivity structure of the martian interior. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	basement rock; electrical conductivity; frequency analysis; ionosphere; lava flow; magnetic field; magnetization; Mars; seismic data; wave propagation
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124493
作者单位	Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Planetary Science Institute, Tucson, AZ, United States; Laboratoire de Planétologie et Géodynamique, UMR-CNRS 6112, Université de Nantes, Université d’Angers, CNRS, Nantes, France; Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Cornell Center for Astrophysics and Planetary Science, Ithaca, NY, United States; Space Sciences Laboratory, University of California, Berkeley, CA, United States; Laboratoire de Météorologie Dynamique / Institut Pierre-Simon Laplace (LMD/IPSL), Sorbonne Université, Centre National de la Recherche Scientifique (CNRS), École Polytechnique, École Normale Supérieure (ENS), Campus Pierre et Marie Curie BC99, Paris, France; Marshall Space Flight Center, Huntsville, AL, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Université Paris Diderot-Sorbonne Paris Cité, Institut de Ph...
推荐引用方式 GB/T 7714	Johnson C.L.,Mittelholz A.,Langlais B.,et al. Crustal and time-varying magnetic fields at the InSight landing site on Mars[J],2020,13(3).
APA	Johnson C.L..,Mittelholz A..,Langlais B..,Russell C.T..,Ansan V..,...&Banerdt W.B..(2020).Crustal and time-varying magnetic fields at the InSight landing site on Mars.Nature Geoscience,13(3).
MLA	Johnson C.L.,et al."Crustal and time-varying magnetic fields at the InSight landing site on Mars".Nature Geoscience 13.3(2020).