Convective Regeneration and Diffusion of Magnetic Field

Details Convective Regeneration and Diffusion of Magnetic Field Convective Regeneration and Diffusion of Magnetic Field

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988acaps...8..117t&link_type=abstract

Acta Astrophysica Sinica, Vol. 8:2, P. 117, 1988

Astronomy and Astrophysics

Astrophysics

Scientific paper

The regeneration and diffusion terms with special cyclonic convective cells are discussed in two-scale mean-field electrodynamics. According to the dynamo equation, the patterns of the induced electric force in a cyclonic convective eddy are obtained. It is shown that the non-dimensional regeneration coefficient is αarcmin ≈ -0.4 ≡ +0.4 and the non-dimensional diffusion coefficient is βarcmin ≈ 0.05. This α effect is consistent with the α coefficient of α-ω dynamo models which are in agreement with the observed solar magnetic cycle. The β coefficient derived from observations and the α-ω dynamo model is about 20 times as large as the calculated result, when the rotational velocity is 100 m/s and the characteristic dimension of the convective eddy is 1000 km.

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