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Antidynamo theorems for non-radial flows

 

作者: D.J. Ivers,   R.W. James,  

 

期刊: Geophysical & Astrophysical Fluid Dynamics  (Taylor Available online 1988)
卷期: Volume 40, issue 1-2  

页码: 147-163

 

ISSN:0309-1929

 

年代: 1988

 

DOI:10.1080/03091928808208823

 

出版商: Taylor & Francis Group

 

关键词: Antidynamo theorems;dynamo theory

 

数据来源: Taylor

 

摘要:

Magnetic fields induced by non-radial compressible flows (vr≡ 0, ∇·v≢ 0) in spherical conductors are shown to decay, or at least be incapable of indefinite amplification. The results herein supplement previously established antidynamo results for purely toroidal flows (vr≡ ∇·v≡ 0), with the allowance of compressibility necessitating new proofs with different senses of field decay. The poloidal field variabler·Bdecays in a global sense with an undetermined decay rate. A pointwise bound is established that limits the ultimate strength of the toroidal field scalar T, and shows that if the poloidal field is negligible and the conductivity uniform then the toroidal field decays to zero at no slower than the poloidal free-decay rate π2.

 

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