Geomagnetic core‐mantle coupling
Geomagnetic core‐mantle coupling
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DOI：
10.1029/jz067i012p04833
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发表时间：
1962-11
影响因子：
--
通讯作者：
M. Rochester
中科院分区：
文献类型：
--
作者：
M. Rochester
起源于地核的不断变化的磁场穿透了导电的下地幔。洛伦兹力（j×B）与这些磁场和电流的相互作用在地幔上产生了一个机械扭矩。通过使用麦克斯韦应力表示，该扭矩的表达式被证明可以简化为核幔边界上的表面积分−1/μ π（r×B）BrdS。这一结果对于研究由于电磁耦合的地核和地幔之间的角动量转移而导致的日长和极的地理位置的可能变化具有重要意义。
The electrically conducting lower mantle is penetrated by changing magnetic fields originating in the earth's core. The Lorentz force (j×B) interaction of these fields with the electrical currents there produces a mechanical torque on the mantle. By using the Maxwell stress representation the expression for this torque is shown to reduce to the surface integral −1/μ ∫ (r×B) BrdS over the core-mantle boundary. The result is important in the study of possible changes in the length of day and the geographical position of the pole, due to angular momentum transfer between the electromagnetically coupled core and mantle.