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W. O&#x;Reilly 《Physics of the Earth and Planetary Interiors》1980,21(1):72-75
Analysis of geomagnetic secular variation data from world observatories demonstrates the occurrence of a secular variation impulse in the late 1960's. When a simple mantle conductivity model is used in conjunction with the impulse data, it can be shown that the average conductivity of the lower mantle does not exceed 150 ω?1 m?1. This is orders of magnitude smaller than recently published values. 相似文献
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