Secular variations of geomagnetic field caused by the fluctuation in the fluid flow in the outer-core

Liu Qingsong; Zhu Rixiang; Pan Youngxin

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Secular variations of geomagnetic field caused by the fluctuation in the fluid flow in the outer-core

机译：外芯中流体流动的波动引起的地磁场的长期变化

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The theoretical spatial power spectrum of a dipole located at(r_0,θ_0,φ_0)can be fit- ted by a straight line in logarithmic scale when n is larger than 2. Based on the spherical har- monic coefficients of geomagnetic field during 1900-1995, the depth(r_0)of source-layer of ev- ery 5a is calculated. the results show that r_0 decreased from 1900 to 1960; abruptly changed from 1945 to 1950 related to some kind of disturbance; decreased again from 1960 to 1975; in- creased from 1975 to 1985; and kept stable after 1985.

机译：当n大于2时，位于（r_0，θ_0，φ_0）处的偶极子的理论空间功率谱可以用对数刻度的直线拟合。基于1900-2000年期间地磁场的球谐系数1995年，计算出每个5a的源层的深度（r_0）。结果表明r_0从1900下降到1960;从1945年到1950年由于某种干扰而突然改变；从1960年到1975年再次下降；从1975年到1985年有所增加；并在1985年后保持稳定。

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《Chinese science bulletin》 |1999年第13期|p.1214-1218|共5页
作者
Liu Qingsong; Zhu Rixiang; Pan Youngxin;
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正文语种 eng
中图分类自然科学现状及发展;
关键词
r_0; eomagnetic Jerk; length-of-day;

机译：r_0;地磁冲击一天的时间;

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8. Constraints on Geomagnetic Secular Variation Modeling from Electromagnetism and Fluid Dynamics of the Earth's Core [R] . Benton, E. R. 1986

机译：地球核心电磁学和流体动力学对地磁长期变化模拟的制约

Secular variations of geomagnetic field caused by the fluctuation in the fluid flow in the outer-core

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