古地磁学在地磁场起源研究中的应用

APPLICATION OF PALEOMAGNETISM TO STUDY OF THE ORIGIN OF THE EARTH'S MAGNETIC FIELD

地磁场起源及其倒转是地球科学的难题之一。究其原因一方面是由于无法直接观测地球内部发生的物理过程,另一方面是由于缺乏理论与实验相结合的综合研究。本文以磁流体力学为基础,将古地磁学与αω发电机理论结合在一起进行分析和研究。得出了如下新观点:(1)洛仑兹力在地核发电过程起负反馈作用;(2)较差旋转控制着地磁场西向漂移,(3)α作用使地磁极偏离地球自转轴。

The origin and reversal of the Earth's magnetic field is still a puzzle in geophysics. There are two reasons for this, one is that the physical process in the Earth's core can not be observed directly, and another is that scarce studies were carried out in combining paleomagnetic data with magnetohydrodynamics. Based on paleomagnetism and αω dynamo theory, some new results are obtained in this paper: (1) Lorentz force results in negative feedback in the dynamo process in the Earth's core; (2) westward drift of the geomagnetic field is determined by the difference of rotation between the Earth's coie and mantle: (3) α effect makes the geomagnetic dipole tilt at some angles with respect to the axis of rotation.