地球失磁与地磁极性倒转的探讨  

The discussion about the earth lost magnetism and the geomagnetic polarity reversal

作　　者：李安生[1] 李国栋[2] 

机构地区：[1]安阳师院物理系,中国河南455002 [2]中国地质大学信息工程学院,中国武汉430074

出　　处：《地震地磁观测与研究》2008年第6期27-31,共5页Seismological and Geomagnetic Observation and Research

摘　　要：在地磁成因的磁核观点基础上,探讨了地球失磁与地磁极性倒转的可能原因,地球失磁可能是内核温度升高造成的。地磁极性倒转发生在地球失磁之后,当内核温度降低至居里点以下时,磁核将重新形成,其方向取决于最核心的磁粒,磁粒的磁场方向,取决于磁粒由顺磁质向铁磁质转变的一瞬间,外部磁化力的合方向,这个方向可能是正的也可能是反的,则地磁极性可能不变或倒转。On the basis of magnetic core view of the cause of geomagnetism, this paper explores the possible reason of the earth lost magnetism and geomagnetic polarity reversal. The cause of the earth lost magnetism is the rise of the temperature in the core. The geomagnetic polarity reversal happens after the earth lost magnetism. When the temperature of the core reduces to the Curie temperature, the magnetic core will form again. Its direction depends on the most central magnetic particle. The direction of the magnetic particle dependes on the resultant of forces of the extorior magnetic action power during the trasformation of the magnetic particle from paramagnet to ferrmagnet. This direction may be positive or negtive, while the geomagnetic polarity may not change or reverse.

关 键 词：地球失磁 地磁极性倒转 磁化 居里点 磁核 

分 类 号：P318.21[天文地球—固体地球物理学]