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

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

Abstract

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 ~ times shorter period than theirs, with highly overlapping cycles; a polar field value of ∼2 kG if one has to produce a ~ kG toroidal field at convection zone base; and quadrupolar parity as opposed to Chatterjee et al.'s dipolar parity solutions.