Dynamo models of grand minima
Contribuinte(s) |
Mandrini, CH Webb, DF |
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Data(s) |
2012
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Resumo |
Since a universally accepted dynamo model of grand minima does not exist at the present time, we concentrate on the physical processes which may be behind the grand minima. After summarizing the relevant observational data, we make the point that, while the usual sources of irregularities of solar cycles may be sufficient to cause a grand minimum, the solar dynamo has to operate somewhat differently from the normal to bring the Sun out of the grand minimum. We then consider three possible sources of irregularities in the solar dynamo: (i) nonlinear effects; (ii) fluctuations in the poloidal field generation process; (iii) fluctuations in the meridional circulation. We conclude that (i) is unlikely to be the cause behind grand minima, but a combination of (ii) and (iii) may cause them. If fluctuations make the poloidal field fall much below the average or make the meridional circulation significantly weaker, then the Sun may be pushed into a grand minimum. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/45354/1/iau_286_cho_2011.pdf Choudhuri, Arnab Rai (2012) Dynamo models of grand minima. In: 286th Symposium of the International-Astronomical-Union, OCT 03-07, 2011, Mendoza, ARGENTINA, pp. 350-359. |
Publicador |
Cambridge University Press |
Relação |
http://dx.doi.org/10.1017/S174392131200508X http://eprints.iisc.ernet.in/45354/ |
Palavras-Chave | #Physics |
Tipo |
Conference Proceedings PeerReviewed |