| 地磁場倒轉的电磁模型 |
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| 引用本文： | 陈志強,祁貴仲.地磁場倒轉的电磁模型[J].地球物理学报,1964,13(4):273-285. |
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| 作者姓名： | 陈志強 祁貴仲 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 本文是根据地球基本磁場起源的“发电机”理论而提出的地磁場倒转的电磁模型,认为地磁場的倒转是地核内部“环型”場反向的结果,若地球转速的“突然”扰动够大,则地幔与地核之间的电磁作用可以引起地球内部“环型”場的反向,从而实现地磁場的倒转,计算表明,这一扰动的性质是地球蒋动周期的减小,其数量级为10~2毫秒。文章的末尾计论了反向地磁場的维持问题,得出倒转磁場维持的时间间隔约为10~3年-10~6年。
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| 关 键 词： | 电磁模型 地磁场 发电机 地核 地球内部 偶极子 反向发电 环型 角速度 扰动 |
AN ELECTROMAGNETIC MODEL OF THE REVERSAL OF THE GEOMAGNETIC FIELD |
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| CHEN CHI-CHIANG AND CHI KUEI-CHUNG.AN ELECTROMAGNETIC MODEL OF THE REVERSAL OF THE GEOMAGNETIC FIELD[J].Chinese Journal of Geophysics,1964,13(4):273-285. |
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| Authors: | CHEN CHI-CHIANG AND CHI KUEI-CHUNG |
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| Abstract: | An electromagnetic model of the reversal of the geomagnetic field, based on Bullard-Parker's dynamo theory of the origin of the main geomagnetic field is described. It is shown that a reversal of the geomagnetic field may arise in that case when the toroidal field in the earth's interior turns itself into the opposite direction. The authors further show that if a large enough "sudden fluctuation" is given to the earth's rotation by whatever means, then the electromagnetic interaction between the core and the mantle may give rise to a reversal of the toroidal field and consequently a reversal of the geomagnetic field. The calculation indicated that the "sudden fluctuation", which should be a decrease of the period of the Earth's rotation, is large enough only when its order of magnitude is greater than 10~2 ms. At the end of the work the time interval of each reversal is discussed. It is shown that each reversal can last 10~3-10~6 years. |
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