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SUMMARY:Competing Local and Non-Local alpha-effects for a Simplified Flux 
 Transport Dynamo Model - Peter Mann (University of Cambridge)
DTSTART:20091027T130000Z
DTEND:20091027T140000Z
UID:TALK19887@talks.cam.ac.uk
CONTACT:Dr. Aurélien Crida
DESCRIPTION:The solar magnetic field is maintained by a hydromagnetic\ndyn
 amo\, and it is generally accepted that strong toroidal magnetic field\n  
 is produced at the tachocline below the solar convection zone. The\nlocati
 on of production of the poloidal field via the alpha-effect is\nstill in q
 uestion. One such location is the solar surface\, where decay\nof bipolar 
 magnetic regions produces poloidal magnetic field\, this is\nknown as the 
 Babcock-Leighton mechanism. Another possible location is\nthe base of the 
 solar convection zone.  Recent work has looked at the\ncompetition in the 
 solar dynamo between surface and deep-seated\nalpha-effects. The alpha-eff
 ects studied were local effects.\nHowever\, flux-transport dynamo calculat
 ions use non-local poloidal\nsource terms\, that is\, they act at the surf
 ace but are proportional to\nthe toroidal field at the base of the convect
 ion zone. We will discuss\nthe effects of non-local competing alpha-effect
 s on the dynamo\nequations to explore the validity of this type of model. 
 We will also\ninclude the effects of meridional circulation.
LOCATION:MR14\, DAMTP\, Pav. F
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