EDP Sciences
Free access
Volume 437, Number 2, July II 2005
Page(s) 699 - 702
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20042435

A&A 437, 699-702 (2005)
DOI: 10.1051/0004-6361:20042435

Comments on "Full-sphere simulations of circulation-dominated solar dynamo: Exploring the parity issue"

M. Dikpati, M. Rempel, P. A. Gilman and K. B. MacGregor

High Altitude Observatory, National Center for Atmospheric Research, PO Box 3000, Boulder, Colorado 80307, USA
    e-mail: dikpati@hao.ucar.edu

(Received 3 December 2004 / Accepted 22 March 2005)

Using two distinct simulation codes that respectively apply semi-implicit and fully explicit schemes, we perform calculations of a 2D kinematic Babcock-Leighton type flux-transport dynamo with Chatterjee et al.'s parameter settings. We show that their solutions are diffusion-dominated, rather than circulation-dominated as their title implies. We also have been unable to reproduce several properties of their dynamo solutions, namely we obtain a much faster cycle with ~4 times shorter period than theirs, with highly overlapping cycles; a polar field value of $\sim $2 kG if one has to produce a ~100 kG toroidal field at convection zone base; and quadrupolar parity as opposed to Chatterjee et al.'s dipolar parity solutions.

Key words: Sun: magnetic fields -- methods: numerical

© ESO 2005