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Hydromagnetic scale analysis at Earth's core-mantle boundary

 

作者: EdwardR. Benton,  

 

期刊: Geophysical & Astrophysical Fluid Dynamics  （Taylor Available online 1992）
卷期: Volume 67, issue 1-4  

页码: 259-272

 

ISSN:0309-1929

 

年代: 1992

 

DOI:10.1080/03091929208201847

 

出版商: Taylor & Francis Group

 

关键词: Scale analysis;core-mantle boundary;magnetic and velocity field amplitudes

 

数据来源: Taylor

 

摘要:

Scale analysis of the MHD equations appropriate to the surface layers of the Earth's outer core is used to understand why the peak amplitude of the geomagnetic field on the core-mantle boundary (CMB),B0, is some 8 gauss, corresponding to an Alfvén speed of at least 200 km/yr in the core; and why the horizontal fluid motion just beneath the CMB reaches a typical speed, ν0, of only about 30 km/yr.

 

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