Modern trends in dynamo theory
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About this item
| Description: |
Proctor, M (DAMTP, University of Cambridge)
Thursday 13 December 2012, 11:30-12:30 |
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| Created: | 2013-01-07 09:31 |
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| Collection: | Topological Dynamics in the Physical and Biological Sciences |
| Publisher: | Isaac Newton Institute |
| Copyright: | Proctor, M |
| Language: | eng (English) |
| Distribution: |
World
(downloadable)
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| Explicit content: | No |
| Aspect Ratio: | 16:9 |
| Screencast: | No |
| Bumper: | UCS Default |
| Trailer: | UCS Default |
| Abstract: | Dynamo action is the process by which magnetic fields in astrophysical bodies (and recently, laboratory fluids) are maintained against resistive losses by Faraday induction. For many years a favoured model of this process, known as mean-field electrodynamics, has been widely used to produce tractable models. I shall present a critique of this theory and contrast it it with another dynamo process (small scale dynamo action) that does not, unlike mean-field electrodynamics, rely on broken reflection symmetry or scale separation. Finally, I shall talk about very recent rigorous results concerning the Archontis dynamo, in which the magnetic and velocity fields are closely aligned. |
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