DOI: 10.1002/2017JE005511
Scopus记录号: 2-s2.0-85046820662
论文题名: Paleopole Reconstruction of Martian Magnetic Field Anomalies
作者: Thomas P. ; Grott M. ; Morschhauser A. ; Vervelidou F.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 5 起始页码: 1140
结束页码: 1155
语种: 英语
英文关键词: Equivalent Source Dipole method
; Martian crustal magnetic field anomalies
; polar reversal
; true polar wander
Scopus关键词: geodynamics
; geodynamo
; magnetic anomaly
; magnetic field
; Mars
; planetary evolution
; polar wandering
; reconstruction
; remanent magnetization
英文摘要: The crust of Mars shows strong remanent magnetization, which was likely acquired during the early phases of planetary evolution when a core dynamo still operated. The direction of the field responsible for magnetizing the crust holds clues to the working of the dynamo and the rotational dynamics of the planet. By analyzing individual crustal magnetic field anomalies and with the aid of additional assumptions, the field orientations can be reconstructed. We have implemented an Equivalent Source Dipole method to determine the main field orientation during magnetization, assuming that the considered anomalies are unidirectionally magnetized without making specific assumptions about the source geometry. The available data are fit in a least squares sense, and the method yields confidence intervals for the admissible paleopole locations. The method was applied to six crustal magnetic field anomalies, two of which require a south pole in the northern hemisphere, while three indicate a south pole in the southern hemisphere. This implies that polar reversals took place at least once in Martian history. Furthermore, one of the investigated anomalies requires a south pole at equatorial to midlatitudes, indicating that a significant amount of true polar wander must have occurred on Mars. Finally, tests with synthetic data indicate that admissible paleopole locations typically spread across at least 25% of the planet, which may partially explain the scatter found in previously published paleopole studies. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113917
Appears in Collections: 气候减缓与适应
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作者单位: Department of Planetary Physics, German Aerospace Center, Berlin, Germany; Section 2.3 Geomagnetism, German Research Centre for Geosciences, Potsdam, Germany
Recommended Citation:
Thomas P.,Grott M.,Morschhauser A.,et al. Paleopole Reconstruction of Martian Magnetic Field Anomalies[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)