Thermal core-mantle coupling in an early lunar dynamo: Implications for a global magnetic field and magnetosphere of the early Moon

Futoshi Takahashi, Hideo Tsunakawa

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

A theoretical model suggests a short-lived lunar dynamo driven by a mantle overturn forming crustal thickness dichotomy, while the lunar paleomagnetic data and crustal magnetic fields suggest both of presence and absence of a global magnetic field of the Moon ∼4 billion years (Gyr) ago. Here we carry out numerical simulations of a possible lunar dynamo, including effects of mantle overturn on heat flux heterogeneity at the core-mantle boundary. As a result, the surface field intensity of the lunar dynamo is about 100 πT. In this case, a lunar magnetosphere could be present with a sunward size of 1.4 times the Moon's radius. Considering the 4.6 Gyr orbit evolution of the Moon, the magnetic field intensity and the magnetosphere size could be larger, suggesting the lunar crustal magnetization acquired in tne ancient dynamo field.

本文言語英語
論文番号L24202
ジャーナルGeophysical Research Letters
36
24
DOI
出版ステータス出版済み - 12 1 2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球惑星科学(全般)

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