On Backus' necessary condition for dynamo action in a conducting sphere
作者:
MichaelR. E. Proctor,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1977)
卷期:
Volume 9,
issue 1
页码: 89-93
ISSN:0309-1929
年代: 1977
DOI:10.1080/03091927708242317
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A reexamination is made of Backus' (1958) strain rate criterion for dynamo action. It is shown that his bound can be strengthened by about 25% by using a sharper estimate of the strength of electromagnetic induction. The new formulation also allows treatment of an arbitrary spherically symmetric conductivity distribution outside the sphere; it is found that allowing external currents reduces the necessary strain-rate.
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