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SUMMARY:Modern trends in dynamo theory - Proctor\, M (DAMTP\, University o
 f Cambridge)
DTSTART:20121213T113000Z
DTEND:20121213T123000Z
UID:TALK42025@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Dynamo action is the process by which magnetic fields in astro
 physical 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) th
 at does not\, unlike mean-field electrodynamics\, rely on broken reflectio
 n symmetry or scale separation. Finally\, I shall talk about very recent r
 igorous results concerning the Archontis dynamo\, in which the magnetic an
 d velocity fields are closely aligned.\n
LOCATION:Seminar Room 1\, Newton Institute
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