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一个长寿的月球动力发电机,由持续的机械动驱动.
C A Dwyer1, D J Stevenson, F Nimmo
1Department of Earth and Planetary Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA. cadwyer@ucsc.edu
Nature
|November 11, 2011
概括
地球驱动的前行可能为月球的古老磁场提供了动力. 这种机械动模型解释了长时间的月球动力发电机及其最终关闭,因为月球远离地球.
科学领域:
- 行星科学 行星科学
- 地质物理学 地质物理学
- 天体物理学 天体物理学
背景情况:
- 月球岩石揭示了一个古老的磁场,这表明一个月球动力发电机.
- 传统的动力发电机模型很难解释月球动力发电机的存在和持续时间.
- 月球的磁场持续了4亿多年.
研究的目的:
- 研究机械作为月球动力发电机的替代机制.
- 模拟由月球的地幔和核心之间的微分运动驱动的动力发电机生成.
主要方法:
- 研究了由地球驱动的月球旋转轴前行引起的连续机械动.
- 模拟流体运动和功率要求,为动力发电机运行超过10亿年.
- 分析了420亿年前磁场的产生,其强度超过1微图斯拉.
主要成果:
- 机械动很容易产生必要的流体运动和动力,以长时间的月球动力发电机.
- 该模型预测,在42亿年前,磁场强度超过1微图斯拉.
- 月球动力发电机预计会随着月球远离地球而自然关闭.
结论:
- 机械动提供了一个可行的机制来产生古老的月球磁场.
- 大约27亿年前,当月球达到大约48地球半径时,动力发电机关闭了.
- 月球古磁数据可以限制月球的早期轨道演变,并适用于其他天体.
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